BULLETIN
OF
LOS ANGELES COUNTY
HORTICULTURAL COMMISSION
THE
HORTICULTURIST'S
HAND BOOK
Bulletin No. 1
1Q13
LOS ANGELES COUNTY
COMMISSION OF HORTICULTURE
WILLIAM WOOD, COMMISSIONER
THE
HORTICULTURIST'S
HAND BOOK
EDITED AND COMPILED
By
B. R. JONES
Deputy Commissioner of Horticulture
Published by
THE BOARD OF SUPERVISORS
LOS ANGELES
1913
Introduction.
By means of this little book the Horticultural Commissioner of
Los Angeles County and his staff send greeting to everyone in-
terested in growing plants and trees into whose hands the book
may fall, and more especially the careful painstaking fruit growers
who have figured so largely in making this and adjoining counties
the attractive abiding places which are drawing toward them the
appreciative people from all lands.
Our office is in business for the purpose of assisting the tree
and plant grower in every way possible, not only to get the best
results for the present time, but to keep his, and his neighbors'
trees in such condition that the future results will be, at least,
equally gratifying, and if possible to better the conditions year
by year.
In this work we have endeavored to meet the need for a col
lection of useful information along the line of our work, which
can be placed in our growers' hands, and which will, in condensed
form, give information helpful in almost any problem likely to
come to him in his ordinary experience.
We do not intend, in any respect, to compete with the very
excellent literature issued from our State Agricultural Experi-
ment Station, but to condense and combine the information, in
most cases obtained from these bulletins, for more convenient
reference in any emergency.
We are greatly indebted to this branch of the College of Agri-
culture, not only for the able treatises on the various insect and
plant matters, from which we have obtained much of the data for
this work, but also for copies of their illustrations which they
have so kindly provided for us; and for assistance in the same
way, our State Horticultural Commissioner's office is entitled to
our earnest expressions of appreciation.
i
We know of no publication similar to this in the State now,
excepting one by Mr. O. E. Brernner, long out of print, and from
which we have taken the liberty to quote in several instances.
We would like to say a word here of the work, of our office in
general. We have endeavored to so conduct it as to give the best
possible service, first to the fruit growers of the County, for whose
benefit the office was created and for whom it is maintained,
also to benefit the nurserymen who furnish trees to the growers,
and those who only grow trees and plants for the gratification af-
forded by the sight of beautiful horticultural growth.
At times we have found it necessary, in our judgment, to insist
upon a course of action not approved of by all the growers, and
to which they strenuously objected, and though the task was not
at all a pleasant one, we have endeavored to follow the best course
for the good of all concerned, and to treat all alike "without fear
or favor, believing that the future will show those who felt agrieved
'that this course was best. Past experience would seem to prove
that this will be so, as we now encounter only a fraction of the
opposition which was hurled against our work only three or four
years ago. We believe the work has proved its own value in most
cases, and people in general are now demanding it much more fre-
quently than fighting it.
In the cities and towns of our County, the benefits of our work
are not as apparent as among the ranches and orchards, but when
we consider that much of the nursery stock planted in the orchards
is sold and often grown, in the towns, where it will become infested
if the town trees are dirty, a different light is cast on this matter,
and we must always remember that we are protecting your neigh-
bors as well as yourselves, and in our work we are emphatically
"our brother's keeper."
In the towns where our office must do most of the work found
necessary in treatment of the trees, we have this season arranged
to have it done by tents and other appliances owned by the County
and operated by crews hired by the day or hour, and the charge
made on an itemized account, of time, chemicals and tent hire actu-
ally employed in the work, no profit being allowed to anyone. We
find this plan more satisfactory even if no great saving is made,
as each tree owner sees just what he is paying for.
We earnestly solicit the patient forbearance of our tree owners
for our mistakes, for we shall make some, and their co-operation
in the work, attempted entirely for their benefit, and from which
we shall exclude in every way possible, any suspicion of contrib-
uting to private gain at the expense of public good.
We are trying to keep a very close watch on all incoming trans-
fers of trees and plants which might, by infestation or disease, tend
to make worse the condition of those of any district, and owing
to the size of the County and diversity of plant troubles in differ-
ent parts, we have deemed it best to supervise plant movement even
within the County, and inspect the goods carefully in every case.
This work faithfully done, in connection with the careful inspection
by the State Quarantine Officers, of all nursery stock coming into
the State, should give us the best possible security from the intro-
duction of new troubles for the grower.
In considering the best way to arrange the things we wish to
say in the following pages, we have decided to divide them into
three parts, viz :
First : Treatment of the more successfully grown fruit and orna-
mental trees and plants of our County, and the insect pests and
diseases usually found troubling them.
Second : These pests and diseases, and how best treated.
Third : How to prepare the materials and carry on the work
of extermination and cure.
Many things we shall say are well known to our older country
residents, but the "new comer" and the town dweller should also
be considered, and some one will find in each statement just the
thing he wanted to know.
The Various Kinds of Fruit and Nut Trees
and Shrubs, Their Insect Pests
and Diseases.
The Apple
The apple can be grown almost anywhere in this County with
but few exceptions. The best is grown in the higher altitudes where
there is something of a winter climate, as in the mountain districts.
We also find in the level valleys, lands where the soil naturally is
moist enough to grow them without irrigation. There are some
varieties which grow to perfection in these sections; Fall Pippin,
White Winter Pearmain, White Bellflower, Maiden Blush, Famous
or Snow Apple, Banana Apple, Missouri Pippin, Red Astrican, and
all of the Crab varieties grow well and are very prolific, often so
much so as to need thinning out.
We find here, like everywhere else, that the apple has numerous
pests: Codling Moth, Woolly Aphis, and near the coast, Mildew.
These are the most serious.
San Jose Scale, the worst pest we have had to contend with in the
past, is no longer a pest, being controlled effectively by parasites..
In some regions like the district north of the mountains, very few
insect pests of any kind are known, and all of the above pests can be.
controlled cheaply by modern methods.
The Apricot
The Apricot is very easily grown, but fruits best on loose soils, and
at an altitude of about 200 feet and over, and nowhere are its crops
as certain as the peach. Owing to its uncertainty, the fruit is more
valuable.
Insect pests attacking the Apricot are : Black Scale ; Brown Apri-
cot Scale ; Frosted Scale ; and Greedy Scale.
—10—
The Almond
The Almond, though thrifty and easily grown, does not produce
well south of the Sierra Madres. Its very early blooming time,
wrhile making it very attractive and ornamental, causes exposure
of the setting fruit to the late cold of spring, with disastrous results.
It is, however, grown quite extensively in the Antelope Valley and
vicinity. Insects attacking it are: Deciduous Red Spider; San
Jose Scale; and Greedy Scale.
The Avocado
The Avocado -or alligator pear grows well in localities fairly free
from frost, and at present there is good market for the fruit. The
demand, howovcr. is limited, and even at much reduced prices the
assimilation of a considesable production would be very uncertain,
in our opinion.
Greedy Scale and Hemispherical Scale work on the trees, but
it is quite free from any other insect pests, although subject to
brown fungus rust.
Berries
Blackberries and Loganberries thrive everywhere in this County
if kept free from insects. Raspberries are more particular as to
loiation, but many are grown.
Pests attacking above are : White Rose Scale ; Black Scale ; Red
Scale; Flat Headed Borers.
Strawberries given proper culture thrive nearly everywhere if
the soil is not too heavy.
Pests attacking them are : Fullers Rose Beetle ; Strawberry
Crown Borer. They are also subject to a fungus on leaves and
stems.
Gooseberries are not as thrifty as farther north, but can be
grown very satisfactorily if given reasonable care. The only insect
pests attacking them is a little Greedy Scale.
Currants bear only in the high altitudes where there is frost
and snow.
Bananas
These plants thrive well until cut by frost. But very little fruit
is ripened, and that if an inferior quality.
Insect pests attacking it are Greedy Scale and sometimes Mealy
Bug, but neither affect the plant much.
—11—
Chestnuts
The chestnut grows well in the sandy soil of the lower country.
Insect pests attacking it are Greedy and San Jose Scale.
Figs
Figs are very easily grown everywhere south of the Sierra
Madres, and the fruiting qualities are determined by the varieties.
A little Greedy Scale and occasionally a few Mealy Bugs are com-
monly the only insect pests attacking figs, but a foliage blight,
probably of fungus origin, sometimes affects them for which Bor-
deaux Mixture is probably the best remedy, and that is not very
effective.
Grapes
The grape is probably the most natural fruit grown in Southern
California. It thrives well in almost all kinds of soil, our annual
rainfall being sufficient to mature good crops without irrigation.
Of the varieties grown, wine grapes predominate. All kinds of
table grapes do well in this County provided there is proper selec-
tion of soil and locality such as the different kinds thrive best in.
Phylloxera, the most dreaded grape vine pest, has never made
its appearance in this County, and every precaution is being taken
to keep it out.
The obscure Anaheim grape disease, which destroyed most of
the vineyards in this part of the State twenty-five years ago, seems
to have worn itself out, as it never has occurred in a virulent form
since. Only an occasional vine may be seen affected with this
disease. Great care should be used that no infestation of this
kind gets to either new or old vines.
We find that most of the table grapes are very susceptible to
mildew. This is always overcome by dusting with sulphur at
blooming time and again when the grapes are one-quarter grown.
Thorough dusting the first time makes less work the second time.
Grapes on a home place in the city or elsewhere, that do not bear
well, can almost always be made productive by proper sulphuring..
Guavas
This peculiar sub-tropic fruit, ripening at the beginning of win-
ter, is grown with surprising ease in localities free enough from
frost for the fruit to mature. Insect pests attacking this fruit
—12—
are very few and practically of no importance, and I know of
no disease affecting the trees, but in planting, a good variety should
be selected.
Grapefruit
See Pomelo and under Lemons.
Lemons
The lemon, with the orange, the grapefruit and the lime, and a
few other unimportant members of the citrus family are subject
to far more insect pests and diseases than any other crop, trees or
plants of the County. These trees all grow thriftily where reason-
able moisture is supplied, even in quite frosty location, not how-
ever in the frost conditions prevailing north of the mountains.
But profitable fruit production does not always accompany thrifty
growth.
In considering a citrus grove investment, the following con-
ditions must absolutely be present for success. They are, a good
soil, plentiful water supply at reasonable cost, and reasonable
freedom from frost and wind. These secured, and good trees free
from insects or disease planted, and the grower is ready to begin
the fight, which will last as long as he has trees, against insect
pests and disease.
These might be enumerated as follows : Black Scale ; Red Scale ;
Yellow Scale; Oleander Scale; Soft Brown Scale; Hemispherical
Scale; Purple Scale; Citrus Mealy Bug; Longtailed Mealy Bug;
Citrus Red Spider; Silver Mite; Citrus Thrips; with several other
pests watching an opening to invade our State and causing us an
expense of thousands of dollars each year to keep them out; but
in spite of all these drawbacks, intelligent and industrious growers
have realized surprising profits from lemons, oranges and grape-
fruit in the last twenty-five years.
In addition to the above troubles, tree diseases must be watched
for: Gum Disease; Wither-tip; Die-back; Lack of nourishment
(Chlorosis) and several other diseases of less importance.
The lemon crop is injured also by the brown rot, and more than
the other citrus fruits by the unexpected frosts, yet Los Angeles
County shipped last year 1,200,000 boxes of lemons, 2,790,000 boxes
of oranges, 18,900 boxes of grapefruit, at least three-fourths of
them all, marketed at an excellent profit.
—13—
Loquats
This tree grows as thrifty as a eucalyptus anywhere south of
the mountains, and will stand more frost than an orange. The
fruit ripening in the winter is always welcome, though of com-
paratively little value, owing to the large seed. Some varieties
however bear larger fruit with thicker meat, but more acid flavor.
The Greedy Scale and occasionally the mealy bugs are the insect
pests that attack the loquat, and the scaling bark seems to pro-
tect the tree from much injury by them.
Mulberry
The ordinary mulberry is as thrifty and hardy as an oak here,
where it can obtain sufficient moisture, and for silk worm culture,
would probably be the tree to grow, but the fruit is of little value ;
and there are two varieties at least of smaller habit of growth
which produce large luscious fruit somewhat later in the season,
which we would recommend in most cases, though the fruit being
very soft would be difficult to transport. They will attract the
birds and thus protect fruit of more value, ripening at the same time.
A little Greedy, Black and Red Scale are occasionally found
attacking this tree.
Nectarine
The nectarine is very easily grown everywhere in this County,
and is infested with about the same pests as the peach, but seems
especially subject to injury by the Black Peach Aphis.
Orange
See under Lemon. It is more subject to black scale than the
lemon.
Olive
The Olive, though grown with little trouble anywhere south of
the mountains, is profitably productive in only a few locations hav-
ing granite soil, freedom from frosts and fog, and having hot
summers. It is the general opinion throughout the County that
an olive grove is a poor investment. Some varieties, however, in
good localities are yielding fair returns, especially with the im-
proved prices of the last few years. The trees should never be
planted near citrus trees as they are great breeders of Black Scale
and are also attacked by Hederae and Greedy Scale.
—14—
Pomelo (Grapefruit)
The pomelo, though a thrifty grower and free bearer, not more
liable to frost injury than the orange, is particularly liable to attacks
of Black Scale and Mealy Bug, Yearly fumigation is almost a
necessity. It is fairly profitable when grown under right condi-
tions. (See also under Lemons.)
Peach
Very easily grown and a prolific bearer all over the County, no
yellows or rosette known, mildly subject to attacks of Greedy and
San Jose Scale, also Green Aphis and the Black Peach Aphis (Aphis
persicae niger) which latter is somewhat menacing where it has
been introduced. Peach root borer and peach twig borer also do
some injury; a fungus disease known as curl leaf has to be corn-
batted. Some varieties are quite free from it, however, and spray-
ing with Bordeaux Mixture soon after the leaves fall, and perhaps
in spring controls it well.
Pears
The pear tree grows thriftily anywhere in the County and if
kept free from insects and with sufficient moisture, bears well. It
has been much neglected, owing to the pear blight, in latter years
south of the mountains, but produces excellent profits to quite a
number of growers on the north slopes, and in the Antelope Val-
ley region. It is quite subject to the deciduous Red Spider, the
Greedy Scale and the San Jose Scale, and in some localities has
been greatly injured by the Pear Blight, which, however, is well
controlled by Bordeaux Mixture and Lime-Sulphur spray.
Plum
This is perhaps the most productive and healthy fruit tree grown
in our County and the freest from insect troubles. It fruits well
everywhere, though some varieties are better in this respect than
others, and a little Greedy, Black and San Jose Scale, usually
unimportant, are about all the insects found on it.
Prune
This tree, planted to a considerable extent here in former years,
has more lately been much neglected, as in this locality we can not
seem to produce fruit equal to counties further north, and' the low
markets do not warrant growing of inferior fruit.
Insect pests attacking it are about the same as for the plum.
—15—
Pomegranate
A fruit of little market value, and not much valued by most
people. It is easily grown and troubled a little by Greedy Scale
only. As a novelty is desirable for domestic planting.
Persimmon
Very easily grown and little affected by insects. The variety
yielding large fruit is desirable for home use.
Quince
This delicious preserving fruit no one in the County need be
without as it will grow itself with little care when once set out.
Pests attacking it are Black and Greedy Scale, and the Pear Slug
sometimes does damage.
Walnut
A valuable tree for Los Angeles County south of the Sierra
Madres, where frost is not too severe. It thrives best in a moist
alluvial soil, though some good trees are growing in quite heavy
soils. It does not do well in the dry granite soils of the foothills
where irrigation supplies the only moisture in the summer. A
permanently moist subsoil within reach of the roots produces the
best trees, and crops.
Some Greedy and Walnut Scale may be found on this tree, but
the only thing causing the grower much concern is the Walnut
Blight, which has almost ruined many groves and is probably
present to an injurious degree in all of them. Resistant varieties
are being developed and grafted stock produced, which it is confi-
dently hoped will produce blight proof groves in the future. The
walnut tree is also attacked by a walnut aphis which smuts the
leaves and fruit very badly some seasons. It is held in check very
largely by the larva of the common lady-birds. A good walnut
grove is a good investment.
Celery
This vegetable has been grown successfully on all light, fine
sediment soil in the County, and while not generally competing
with the far famed Orange County peat beds, is a profitable garden
crop, and we have some localities which will compare well with
the best.
—16—
Its principal disease is the late blight which affects the lower
leaves first, but later spreads well over the plant, leaving its dark
stains on stalks and preventing the development of the whole plant.
The remedy for this is Bordeaux Mixture applied twice while the
plants are in the seed bed, again about five weeks after they are
set in the field, and once a month thereafter until the rains come.
After that, often enough to keep the leaves well covered, but at
least once in two weeks to protect the new leaves constantly push-
ing up, until harvested. . Many growers consider the expense of
this repeated spraying not justified by the injury usually caused
by the blight.
Asparagus
A wonderfully profitable crop in some localities, but these "right"
localities do not seem plentiful. The rust has caused anxiety the
past few years. It attacks the bushy after growth, checking the
vitality of the plant. No wild asparagus should be allowed to
grow in cutting time. Irrigate and cut well in summer and fall.
After cutting dust tops thoroughly with dry sulphur, and repeat
two or three times later in the season. Always plant seed from
non-rusting plants.
Alfalfa
Our wonderful forage plant has always been very free from in-
sects except the army worm which eats everything, and a locust
which would sometimes eat the foliage of a crop in some localities.
But it is now threatened with the alfalfa weevil from Utah, which
is making great havoc with the alfalfa fields there. Give the State
or County Horticultural Commissioner immediate notice of dis-
covery of any bug or worm which resembles it. We want to run
down every suspicious case. It will be done at State expense
and will cost you nothing.
The Dodder, a parasitic plant, has been a serious pest in many
fields and the seed and plant should be carefully guarded against.
The plant should be destroyed at once when found.
—17—
THE MORE COMMON SHADE AND ORNAMENTAL TREES
AND PLANTS LIABLE TO INSECT INFESTATION
The Pepper
This beautiful tree is unfortunately a very persistent Black Scale
breeder in many localities where other black scale infested trees
are near it, and its size makes its treatment difficult. Spraying,
the only practical method, seems very ineffectual, and probably the
best course with larger trees, is to defoliate them by trimming off
all branches under two inches in diameter. If this is done late in
the fall or early in the winter when shade is not required, the new
shoots will produce the shade again by the following summer, and
the scale will be completely destroyed, for the time at least.
The Black Acacia
The above name, while not scientifically correct for the Black
Wattle (acacia melanoxylon), is the one commonly used here.
(Black Wood is better.) Oleander Scale and Greedy Scale are
the important insect enemies of this fine shade tree, and both
are easily controlled by a good emulsion spray. Cottony Cushion
Scale (Icerya purchasi), though often getting started on this tree,
is soon completely controlled by its lady-bird enemy (Novius car-
dinalis) and a chalcid parasite (Lestophonus iceryae), and need no
attention.
The Camphor
This most beautiful dwarf street and ornamental tree, while easily
grown and very hardy as to injury, has some serious insect and
disease enemies. The Red Scale will kill it sometimes if not
checked. The Greedy Scale has a love for it, and a peculiar blight
of the tender new growth and sometimes of the older leaves checks
its thrift and often makes it quite unsightly for a time. The
former must be controlled by sprays and the latter is a problem
as yet unsolved.
The Sterculia or Bottle Tree
Very easily grown and free from pests and disease except the
Greedy Scale, which often becomes quite thick on the bark, to
the decided injury of the tree.
—18—
The Palms
Some varieties of these trees, so universally hardy in California,
and which fill so large a place in our list of trees, are very free
from insect pests. Of this description are the large fan palm and
some kinds of the date palm. On those infested, the scale is easily
seen along the troughs of the leaves and on the Coccus plumosus
and a few similar sorts on the stalk at the base of the leaves. The
kinds of scale are the Oleander (Aspidiotus hederae), the Greedy
and the Red Scale.
One tree classed with the palms, the Dracaena, often called the
Yucca Palm, is always likely to be infested with Long-tailed Mealy
Bugs, in fact it is one of the worst breeders of this insect and the
hardest to rid of it. The Sago Palm almost always harbors more
or less Black Scale.
Umbrella Tree
Easily grown, but quite subject to Greedy Scale, to an extent
which often injures it badly.
Rice Paper or Rice Tree
Easily grown, somewhat subject to Mealy Bug of both kinds.
Magnolia
A beautiful thrifty tree if watered, subject somewhat to Greedy
Scale and Mealy Bugs. Will grow anywhere south of the mountains.
Cypress (all varieties)
Subject to a Mealy Bug of a kind seldom found on other trees,
but nearly resembling the citrus variety. It is pretty well con-
trolled by a parasite. The tree is very thrifty and hardy.
Norfolk Island Pine
Araucaria excelsa
Beautiful and thrifty if watered. Very subject to a pure white
oval scale peculiar to this tree, called Eriococcus araucariae; fairly
easy to kill with resin wash.
Araucaria Bidwelli (Monkey Puzzle)
Very thrifty with water, and subject to a comparatively rare
scale, similar to Greedy Scale in shape but darker, called Aspidiotus
rossi. Resin wash will kill it.
—19—
Oleander
Easily grown, beautiful but poisonous, even in odor, and a great
Black Scale breeder. Also has Greedy and Ivy Scale. Very diffi-
cult to keep clean.
Castor Bean
This plant should never be allowed to become two years old,
as the Red Scale then begins to breed on it, and it will soon almost
completely cover the smaller branches and thus be communicated
to other trees and plants of value.
The Roses
Many kinds of roses are very clean from insects, while others
growing beside them are covered with Red and Greedy Scale, and
are very difficult to clean. The Rose Scale (Aulecaspis rosae) is
very apt to appear on the older canes near the root, working thence
upward, and Black Scale sometimes gets started on them also.
The Lauristina
A very thrifty and beautiful ornamental shrub, but very subject
to black and other scales.
Euonymous (A variegated leaf shrub)
Very thrifty and easily grown, but quite subject to Black Scale,
Greedy Scale and Mealy Bug.
Nightshade
Very subject to several kinds of scale, Black, Red, Greedy, etc.
Should be destroyed everywhere, and especially should never be
allowed to grow in or near an orchard.
Wistaria
No trouble to grow when once established, though a little slow
in starting, whether set out or raised from seed. In the latter case
it seldom blooms until grafted. It is very subject to Mealy Bugs
if any are about. Also sometimes has a little wistaria scale.
Climbing Potato
A vigorous rapid growing light climber, but sure to be troubled
with Black and Ivy Scale, and very likely Mealy Bug.
—20—
Australian Sweet Pea
A very strong rapid grower and thick and persistent, but sure
soon to be attacked by Black and Ivy Scale and Mealy Bug.
English Ivy
Easily grown and beautiful, but pretty sure to suffer from Ivy
Scale.
Ferns
Many kinds of ferns are attacked by the Hemispherical Scale,
and as the adults are almost proof against sprays, the affected stalks
should be cut out, and as the young scale appear, spray well and
repeatedly with kerosene emulsion. The potted and bedded ferns
suffer alike with this scale.
Umbrella Plants
(Cyclerus alternifolia)
This plant is a prolific breeder of Mealy Bug, and should be very
carefully watched if grown.
Papyrus
Very liable to have Mealy Bug in the tops.
Grevillea
A thrifty tree, hardy to a temperature of 15° with reasonable
moisture. Large, showy, yellow bloom. Constant dropping of the
large leaves is often very annoying about dwellings and is an ob-
jection to the tree. Mealy Bugs, Black and Greedy Scale infest
them to some extent. Distillate emulsion is recommended.
The Privet
(Ligustrum)
A small, pretty hardy, street and ornamental tree near the coast,
having only a little Ivy Scale as insect pest.
The Jacaranda
This easily grown novelty with its fern like leaves has a little
Black Scale with which to contend.
The Pittosporum
This hardy and much admired ornamental tree is much troubled
with Black and Greedy Scale. Frequent spraying with distillate
emulsion will be required to keep it clean.
—21—
The Eucalyptus
This tree has to a reasonable degree met the needs of the south-
west for a timber supply, and some variety can be found which
will just be suited to almost any locality and any requirement of
a tree in our County. However, there are many varieties of them,
and they differ so much that the consideration of a few of the best
in this book, will not be amiss. It is believed that in the future
the requirements of this state for hardwood lumber will be much
more fully met than has yet been done by the eucalyptus. The
eucatlyptus is attacked by very few insect pests or diseases, though
on the seed pods and young shoots of the globulus or Blue Gum,
we sometimes find some Greedy Scale, and a root trouble shows
at times, especially in very damp locations.
Eucalyptus globulus (Blue Gum), the most grown tree in South-
ern California, is of wonderfully rapid growth, and this fact makes
the hardness and heavy weight of the timber the more surprising.
The timber is not, however, durable in the ground, hence is not
suitable for fence posts, telegraph poles or railroad ties, though it
is said to make very satisfactory piles for use in salt water, and
to resist well the action of the toredo and other destructive ocean
insects. To raise for fuel it is one of the best trees for this County,
and if the tendency to check and warp can be obviated, it can be
adapted to wagon manufacture and similar use ; however, if exposed
to the air and weather unpainted, it becomes brittle in a few months.
It makes a good wind break, and for foresting our otherwise useless
foothills, it is among the best trees known. If these hills could be
planted and fire kept out, they would soon be clothed with a val-
uable gum forest.
Eucalyptus tereticornus (Forest Red Gum or Gray Gum) is one
of the best to raise for timber. Durable in the ground, hard, strong,
good grain, well suited to any purpose. Posts of this wood are
reported to have stood in the ground in good condition for 55 years
in Australia. These trees grow about two-thirds as fast as the Blue
Gum, and are probably the best suited to all conditions of our
County of any eucalyptus, standing cold down to 20° and doing
well on the desert. They thrive well on the foothills and the bloom
yields abundance of honey for bees.
Eucalyptus rostrata (Red Gum) is a similar timber to tereticor-
nus, a little slower growth and not as straight, will stand cold to
20° and is a harder, finer grained wood. It is very durable in the
—22—
ground and salt water, fine for inside finish and furniture work,
grows well on the foothills, on the desert or in alkali; blooms fur-
nish good bee food. It is one of the most desirable of the eucalyptus.
Eucalyptus viminalis (Manna Gum) is a quick growing tree, is
hardy as to frost, heat and drouth as any eucalyptus, and makes a
very big tree. It is excellent for a wind break and for foothill
planting, but poor timber, not as good as the Blue Gum.
Eucalyptus rudis (Desert Gum) is one of the best for extremes
of both heat and cold, but it requires a fair amount of moisture. It
makes a good wind break, yields good honey, and the wood lasts
well in the ground. Presumably the wood is hard and serviceable.
Eucalyptus corynocalyx (Sugar Gum) is a fairly rapid grower
and yields a good supply of bee food. Very hardy in all locations
except the most frosty, seeming to stand the heat and drouth well.
The timber is very durable in the ground, and for wagon and similar
construction work, and does not warp badly.
Eucalyptus robusta (Swamp Mahogany) is a very handsome street
tree while young, but becomes more straggling after the fifth year ;
of fairly rapid growth, very tolerant of alkali but not of drouth,
and with timber very durable in the ground but not very strong.
Trees are apt to break with the wind.
Eucalyptus sideroxylon (Red Ironbark) is a dark, rough barked
tree, large but not high, unsuited to hot interior valleys; a nicely
shaped shade tree, and a good forest cover for stony sterile land,
but of slow growth. Good timber for all ordinary uses.
Eucalyptus diversicolor (Karri tree) is a very large stately tree,
and in Australia reaches 400 feet in heighth and 20 feet in diameter.
It requires some moisture and is not a desert tree, but stands cold
to 20°. Growth is fairly rapid, and timber straight grained, which
is rather unusual in Eucalyptus. It is valuable for lumber and
wagon work.
Eucalyptus polyanthema (Red Box) grows to a medium size and
is of fairly rapid growth. It thrives well and is very hardy in all
locations. The timber is very hard, strong and durable for railroad
ties and wagon work, and it makes fine fuel. It has a spreading
habit of growth and makes a fine shade tree, also a good street
or roadside tree.
Eucalyptus populifolia (Poplar-leaved Box) is of medium size,
much resembles polyanthema and is more tolerant of desert con-
ditions.
—23—
Eucalyptus occidentalis (Flat-topped Yate) is a slow growing va-
riety of more spreading habit than most eucalyptus. Does well
everywhere if not too frosty. Should make a good street tree;
timber is good and durable.
Eucalyptus ficifolia (The Crimson-flowered Gum) is of slow
growth, slender drooping branches, flowers bright crimson if va-
riety is not mixed with others ; a very handsome street and orna-
mental tree, but as the wood is tender, must be kept cut back to
prevent breaking and a misshapen top. It is intolerant of frost.
Eucalyptus citriodora (Lemon -scented Gum) is a fairly fast
growing tree of upright habit and furnishing excellent timber for
any purpose, it is similar to hickory, will not stand much frost
or drouth. Its leaves smell like the lemon.
For the data regarding the qualities of the different varieties
of the eucalyptus we have drawn largely from the writings of
James A. McClatchie.
—24—
HARMFUL INSECTS AND THEIR CONTROL
To act intelligently in the control of insect plant pests, we must
remember that they are divided into two general classes, accord-
ing to their habits of attack on the plant.
The sucking insects, including the scales, spiders, mites, plant
lice, squash bugs, etc., obtain their food by inserting their pro-
boscis into the tissues of the plants and extracting the sap, caus-
ing insufficient nourishment to the plant leaves, shown by pale or
drooping foliage.
The biting insects have jaws similar to ours, but which work
sideways, and they take portions of the masticated leaves and
other plant tissues directly into their stomachs, often defoliating
portions of the trees and tunnelling the bark and even the wood.
They include the grasshoppers, leaf-eating beetles, and the many
forms of moth, beetle and butterfly larva, known as cut-worms,
grubs, wireworms and caterpillars.
The biting insects can be poisoned either by arsenical sprays
(Paris Green or Arsenate of Lead) put on the foliage of the plants,
or by similar poisons in tempting food, like dampened bran, or
some kind of green food placed near their haunts.
The sucking variety can be killed either with sprays, which kill
by coming in contact with their bodies, or poisoning the air about
them, or smothering them by closing up their breathing places,
usually a row of holes along their sides, called spiracles.
The kerosene or distillate or caustic emulsions act in the first
mentioned manner, fumigation the second, while resin wash closes
up the spiracles.
The Black Scale
(Saissetia oleae)
The Black Scale (Saissetia oleae) is probably the most widely
known and constantly fought of any scale of the citrus tree, and
is usually pretty well known in the adult stage. It is black, or
nearly so, and has cross ridges on its back in the form of the letter
H, by which it can easily be distinguished from the Hemispherical
and other scales of the same family.
' — 25—
Black Scale, and Lady-bird Larvae (Saissetia oleae) Adult.
The young are hatched but once a year usually, from about
July 1st to September 1st, though where the hatch has not been
controlled by fumigation, off hatches often occur at other seasons.
Some hatch as early as April and May, and in this case they have
time to mature and a second hatch occurs, making two broods in
the one year. The young are, at first, so small as to be seen with
difficulty, are pale yellow and move quite freely but slowly on the
twigs and leaves of the host plant. In a few days they force their
proboscis through the outer skin of the leaves or bark and begin
to live on the sap, seldom moving until about three or four months
old, when they crawl back to the last growth of young wood, seal
themselves fast, remain until matured, when they begin to deposit
eggs. It is difficult to say just how long it takes to deposit all the
eggs, also how long the eggs remain dormant, as weather. conditions
control this scale through all its stages.
They begin to turn darker as soon as hatched and they crawl
from under the shell. A tough skin begins to form over the back
at once, getting thicker and darker as the insect grows. During
the first two months it is so flat and so near the color of the dust
covered leaves that many persons fail to notice it at. all, or if they
—26—
do notice it, fail to recognize it as black scale. In five months it
is about as large as the adult in diameter, but quite flat, a dull blue
in color, and from this time on it is quite difficult to kill with the
best of fumigation, until when full of eggs it becomes almost im-
possible to kill it by a dose the tree will stand, the shell being very
hard and impervious to gas or spray. It is sealed so tight to the
tree that no gass can penetrate it.
When the mother deposits her eggs, her body arches over them,
decreasing in size as the number of eggs increase, until when the
eggs are all deposited to the number of 750 or more, the insect
soon dies, and in about four or five months the hatching begins.
There is one efficient parasite of this scale, a small black fly,
Scutellista cyanea, often called "Scutes," which deposits one or more
eggs under the scale. These hatch before the scale eggs do, and
the resulting larvae lives and grows on an egg diet, often consum-
ing all the eggs before it pupates. After going through the pupa
stage, the mature fly pierces the top of the scale shell and crawls
out. The old scale shells showing holes in the top are only empty
houses where the parasites have done their work and gone. This
largely occurs before the fumigation season begins, and the remain-
ing larva still in the shells are seldom killed by the gas as I have
myself observed. The objection to fumigation, that the parasite
is killed as well as the scale is therefore unfounded as to the larva.
The list of plants and trees harboring Black Scale is very long,
the more common ones include the citrus trees, the pepper, olive,
oleander and apricot, and the wild night shade weed, which last
should never be allowed to grow in or near orchards as an added
breeder of the Black Scale.
The black smut on the leaves of trees infested with this pest
is caused by a black fungus which grows in the honey dew, an
excretion thrown out by the scale and greatly relished by the ants
who always come after it, but who, instead of injuring the scale,
probably help to spread it.
Fumigation beginning at the completion of the hatch and con-
tinued to the blue stage is the only reliable remedy for Black Scale,
though when they are all very young, the kerosene or distillate
emulsion sprayed as strong as the tree will bear, will check them.
But owing to the thick foliage of citrus trees, some scale always
escape the spray, soon to make the trees as bad as ever. On decid-
uous trees, after the leaves fall, carrying many scale with them,
spraying results are much more satisfactory.
—27—
Soft Brown Scale
(Coccus hesperidum)
This scale, for the first month of its life, looks very much like its
black cousin, only a little longer and a trifle lighter in color and
more waxy looking, and at this stage they are so transparent that
the legs of the insect can be quite plainly seen through its body.
Often, however, it shows dark spots beneath its skin, and until
Soft Brown Scale (Coccus hesperidum)
the outer skin becomes thick and a solid brown in color, these dark
spots and streaks show through, making a distinguishing mark.
There may be three or four generations in a year.
The young are born alive and act and feed very similar to the
Black Scale, except that they do not travel far before settling down
for life. The individuals are thus very close together, and they
have the sticky repulsive appearance mentioned above. At the pres-
ent time infestations of this scale soon disappear owing to effective
work of several parasitic flies, whose dark colored larva within cause
the dark spots and streaks seen through the skin. Were it not for
these active parasites, this scale would probably be one of the worst
pests of our citrus groves.
—28—
Hemispherical Scale (Saissetia hemisphaerica) A enlarged individual.
Hemispherical Scale
(Saissetia hemisphaerica)
This scale somewhat resembles the Soft Brown Scale, but is
more elevated, nearer circular at the base, and hard and shining
on the top. The color is a bright brown which is assumed while
they are quite small. They infest ferns principally, but sometimes
other ornamental plants and trees, and occasionally citrus trees,
settling on leaves as well as branches. The adults are hard to kill,
but when young are readily killed by fumigation and thorough
spraying. Good results by spraying depend upon the thorough-
ness of the work.
—29—
The Red Scale
(Chrysomphalus aurantii)
The Yellow Scale
(Chrysomphalus aurantii var. citrinus)
The Red Scale is in many respects a very different insect from
those we have already mentioned. The adult is about the diameter
of a pin head, nearly circular, and varies from gray to brick-red,
in color. The form on top rises gradually from the edge towards
the center, which is marked by a more or less distinctive pyramid
or nipple. It is well protected, with an armored shell above and
a tight film underneath making it very hard to kill by fumigation.
The young are produced alive, not hatching from eggs, and at
all seasons of the year, though much more numerous in the warm
weather.
Red Scale 'C. aurantii) (a) natural size of leaf; (b) female scale greatly
enlarged; (c) male scale greatly enlarged.
In treating trees for its control, the best time is during the summer
or fall months when there is the largest proportion of young, but
good fumigation will bring results at any time, as there is never a
period when all the scale are resistant to the gas. However, this
is always a hard scale to eradicate entirely, and the best time for
fumigation is none too good, some practical men having stated the
Red Scale is as hard to kill as the Purple Scale.
The Yellow Scale is so similar to the Red Scale that each is
often mistaken for the other, and the following are some of the
differences by which they may be distinguished. The Yellow Scale
is much more easily killed than the Red. It is a trifle broader,
thinner and lighter in color. When crushed it will not pop like
the red or produce much moisture, and it is less regular in shape.
It is found on the fruit, the leaves, or more tender new growth,
scarcely ever on the wood, while the Red seldom settles on a leaf,
practically always on the branches and fruit. The Yellow is much
more easily affected by the gas than the Red, and there are other
differences revealed by the miscroscope which establish the fact
that the varieties are distinct, but which are of little practical value
to the grower.
Many of both of these scales always find lodgment on the fruit
of infested trees, and as the Red especially is very difficult to wash
off completely, the sale of the fruit is greatly injured. A depression
seems often to form under a Red Scale which will remain after the
insect is removed, and the lemon, which seems more attractive to
them than the orange, is also more apt to be pitted.
The Red Scale not only infests the citrus trees, but also the cam-
phor very badly, as well as the castor bean, the sterculia, many
varieties of the rose and the nightshade weed. These all serve to
propagate and spread it, though some are of so little value that we
are not much concerned about their infestation. The nightshade
weed should be fought and exterminated everywhere, and especially
about the orchards, and the castor bean should never be allowed
to become over one year old to breed this, one of the worst of the
scales.
The Yellow Scale is of comparatively little consequence.
On citrus trees, fumigation good and s trong, is the only efficient
remedy for Red Scale, and on other trees, repeated spraying with
kerosene or distillate emulsion or resin wash is probably the best
we can do, and if thoroughly done and repeated often, it will keep
the trees in very good shape.,
The Greedy Scale
(Aspidiotus (rapax) camelliae)
The Ivy Scale
(Aspidiotus hederae)
These two scales are in shape much like the Red and Yellow
Scales, but in color are a dirty gray, and are often mistaken by the
uninformed for a fly speck when they appear on a leaf.
Like the Red and Yellow Scale, one of these scales, the Greedy,
usually infests the twigs and branches of the trees, the other the
leaves or very young and tender shoots. The Greedy Scale is also
—31—
quite apt to crowd very closely together, often over-lapping, while
the hederae are almost always separate. The latter is the one
which usually infests English Ivy and the climbing vines and soft
juicy plants, and also the Palms, which often have them very badly.
The Greedy attacks perhaps the greatest variety of plants and trees
of any scale, hence its name, and to many it is very destructive.
Among trees, we find it on all the deciduous fruit trees more or
less, the umbrella often very bad, sterculia, acacias, pepper, camphor,
citrus, loquats and some kinds of grapes. In fact you are likely
to find it on almost any plant that grows if it is bred freely by
some plant or tree in the neighborhood.
These scales are not very difficult to kill, and a good kerosene
or distillate emulsion will get them if well applied and often enough,
at any time of the year.
The Purple Scale
(Lepidosaphes beckii)
The Glover's Scale
(Lepidosaphes gloverii)
We have now come to the scale generally considered the most
difficult to kill and the most destructive to the citrus of all, but it
infests no other tree or plant of importance. It is found on the
branches, leaves and fruit indiscriminately, and if unchecked, be-
comes so numerous as to form a complete crust of scale, particu-
larly on the fruit, so as to hide the skin entirely, rendering the fruit
absolutely unfit for market, and bringing sure death to the tree
eventually.
This scale was introduced on nursery stock into Southern Cali-
fornia 28 years ago by the Walker Bros, of Orlando, Fla. It was
said by horticultural men, who ought to have known better, that
this scale could not live in our climate. Fifty thousand of these
trees were allowed to be distributed and planted in Los Angeles,
Riverside and Orange counties. The greater part of them were
planted in Riverside after being thoroughly dipped in resin wash.
If any Purple Scale survived this treatment the writer has never
heard of it. The greater part of these trees that were planted about
Downey, Rivera and Whittier were not treated, consequently in
two years the trees had become badly infested and the scale had
spread to the older orchards. This was before the sheet tents came
into use, and the method of fumigating large trees at that time was
Purple Scale, Appearance on leaf.
(Lepidosaphes beckii)
so expensive as to make the cost prohibitive. Very little effort
was made to control the scale until 1902. Consequently there were
eighteen years during which it was allowed to spread, and all citrus
trees from Downey north to Pico and east of the Old San Gabriel
River for 20 miles had become more or less infested with it.
In the past 10 years nearly all citrus trees about Whittier, Rivera
and Downey have been fumigated each year with very good results,
and while the growers have kept up a persistent and costly fight
—33—
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—34—
to control the Purple Scale, it should be some consolation to know
that all the other scale pests have been controlled at the same time.
The above should show the necessity of thoroughly treating trees
before planting, and not to rely too much on inspection.
The female of the Purple Scale lays 25 to 30 eggs when she is
about three months old from which are hatched the minute yellow
youngsters who, after crawling around a day or two, settle for life
like the other scales, and throw out a couple of long hairs which
seem to protect them in some way from the larva of the lady-birds
until the scale cover begins to form, but the hairy appearance re-
mains for a month or so and is a good indication that the scale are
young and in good condition to be killed by fumigation.
The young scale are shaped much like an oyster shell, being often
known as oyster shell scale, and the pointed end grows longer as
they become older.
The adult is about y% of an inch long and 1-16 of an inch wide
in the rear, coming nearly to a point at the other end, which in
the female is curved. Three or four generations are hatched in a
year, but the larger number come in the fall months, therefore the
early fall is the best time to fumigate for this scale, but at no time
are they approximately all in about the same condition of growth,
and as the eggs are not usually killed by gas, one fumigation never
gives a complete killing, though lessening them to aomo extent,,
and they have often been treated in this way with benefit.
The plan giving best results is to fumigate well about from August
15th to Sept. 15th, which kills the scale then in the breathing stage,
then in about ten weeks, when the eggs remaining have hatched,
but the young are not old enough to begin laying eggs, fumigate
again, which will put the trees in good shape, and the hatch for
the future will come more nearly at the same time so that the regu-
lar treatments at the usual periods will keep the trees in good
shape, and for those who can afford to follow this plan it is econ-
omy for them to do so. Sprays have practically no effect on this
scale, and only the best of fumigation will be satisfactory.
The Glovers Scale belonging to the same family with the Purple
Scale is of comparatively very little importance. Its appearance
is very similar, but it is not so broad in the rear, is more nearly
straight and not usually quite so long. We know of none in this
County on citrus trees, and very little in Southern California, but
on box-wood we very frequently find it. Fumigation is the best
remedy.
—35—
The Citrus Mealy Bug
(Pseudococcus citri)
The Long-Tailed Mealy Bug
(Pseudococcus adonidum)
The Cypress Mealy Bug
(Pseudococcus ryani)
The mealy bug is a pest which has seemed to spring into great
importance in the past three or four years. It is a small oval shaped
bug about one-eighth of an inch long at its largest, in shape much
like the damp bugs or sow bugs found under boards in damp places,
but white as if flour had been sprinkled all over it. The long-
tailed kind have from three to five long hairs nearly parallel, pro-
truding from the rear, the hairs being nearly as long as the bug.
In the East they are a greenhouse pest constantly fought, and
here are found on a great number of plants and trees, those for
which we are most concerned being of course the citrus trees.
Citrus Mealy Bug. (Pseudococcus citri)
Much enlarged.
Long Tailed Mealy Bug (Pseudococcus adonidum)
Much enlarged.
The female of the citrus mealy bug deposits 350 to 400 eggs,
protecting them in a cottony substance which she secretes, and
they hatch in about two or three weeks according to the tempera-
ture. There are probably four or five generations a year. The
male is a two winged fly.
They infest the branches, leaves and fruit of the citrus trees,
and in the latter are very often hidden in the navel, and under
—36—
the husk like collar about the stem, and in these places are almost
impossible to remove or kill by sprays. If left on packed or cur-
ing fruit they continue to breed and eat and grow until the whole
package is infested. Many come to our ports on pineapples from
Hawaii after a voyage of some length, proving their tenacity of life.
They secrete a honey-dew, and the smut produced thereby with
the masses of cottony material on the tree and fruit, have a very
repulsive appearance. The growth of the tree is not materially
checked unless the infestation is very bad, but the sale of the fruit
is much injured, and ruined if bad, as it is impossible to clean it
all, and the severe washing causes decay and loss.
The ants are sure to accompany the bugs, but as in the case
of the Black Scale, they never injure them, but undoubtedly carry
the young from place to place and aid in their spread.
In some localities spraying seems to have given as good re-
sults as anything, and at lower cost than fumigation, but our ex-
perience leads us to believe that fumigation is the best, all things
considered. Spraying can never eradicate the insect, only control
it, and if repeated as often as necessary for good results, it is as
expensive as fumigation, and we believe that if the latter is per-
sisted in, they can be eradicated.
The Long-tailed Mealy Bug has habits of life very much like
the Citrus Mealy Bug, and it is often found on citrus trees, but
will infest nearly every kind of plant if one of its favorites is in
the neighborhood. One of the greatest of these favorites is the
Dracaena Palm, often called the Yucca Palm. The crown of
pointed leaves at the top is very often alive with the bugs, and
some can be found on almost all. The magnolia also has them,
but not so badly, also the papyrus and the umbrella plant, and
similar ornamental plants.
The Cypress Mealy Bug lives only on the cypress trees, either
in hedges or growing singly, and is of little importance compar-
atively.
On trees and plants other than the citrus, spraying is probably
our only resource, and the distillate emulsion and the carbolic acid
spray we consider the best. Each has its advocates in different
localities.
—37—
The Citrus Red Spider
(Tetranychus mytilaspidis Riley)
The Six Spotted Red Spider
(Tetranychus sexmaculatus Riley)
The Almond or Deciduous Red Spider
(Bryobia pratensis)
The Silver Mite
(Hriophyes oleivorus)
These little creatures, while not belonging to the insects, but
to the spider or mite family, are of great interest to the fruit
grower. They are very small and difficult to detect, though the
bright red color of some are in strong contrast to the leaves and
fruit, and with a pocket or miner's glass, they can be seen quite
plainly in all their ugliness, for they are perhaps the most repul-
sive looking of all our plant pests.
The Citrus Red Spider infests citrus trees only, but the Bryobia
are very plentiful on some deciduous trees, especially the almond,
while the sexmaculatus work great havoc with beans, peas and other
similar plants. All are more plentiful in the spring, but some are
on the trees and plants the year around.
They suck out the juices of the leaves, leaving a pale colored
spot later turning to an ashy gray or yellowish appearance, ana
if the infestation is bad, the leaves soon drop.
The Citrus Spider or mite is bright red when adult, but paler
in color when young, and can be detected on both fruit and leaves.
The eggs are deposited singly, mostly along the ribs of the leaves,
and ^are globular and bright red in color. From a little mast stick-
ing up from the top of the eggs, guy threads run to the leaf sur-
face all around, probably to anchor the egg more firmly, but a
good glass is required to see these guys.
The Bryobia on the almond, pear, apple, plum and cherry ha?
much the same affect on the tree as the Red Spider on the citrus
trees, but it can be detected more easily by its eggs, which, with
the remains of hatched eggs,, form patches of various sizes, light
gray in color, but with the red egg showing through. They will
color the fingers red if rubbed on them and they completely hide
the bark on which they form. The patches appear first about the
buds, but on the almond especially, will sometimes cover the whole
of many of the smaller branches. They thrive best in hot weather.
On plants infested with the sexmaculatus, the eggs show plainly
—38-
Citrus Red Spider, side view, Female.
in small masses, but both the eggs and the mites are lighter in
color, and the latter, under a good glass, will show six odd shaped
spots on the back. They make the leaves of the plant turn yellow
and fall, beans especially. They also infest the underside of citrus
leaves.
The Silver Mite, while not known in our county, is quite com-
mon in a neighboring one, and should be guarded against. They
work on citrus trees, on the leaves, much like the Citrus Mite, but
on the fruit they extract the oil and coloring matter from the rind,
giving the lemon a silvery appearance, and a russet color to the
orange.
There is also the Blister Mite which attacks grapes, walnuts,
pears, etc., forming blister like excretions on the leaves, but we
know of no trouble from it here.
Citrus Red Spider (Tetranychus mytelaspides) Male.
—40—
For all these spider sand mites, the remedy is sulphur. It can
be used dry in which case it should be as fine and pure as pos-
sible, and applied in the early morning, preferably by blowing it
into the foliage as thoroughly as possible while the leaves are damp
so it will stick to them. It is also much more effective in warm
weather, as it is the fumes liberated by the heat that do the work.
It is often mixed with half as much lime, air-slacked, to make it
adhere better to the leaves.
The liquid lime sulphur sprays are also very efficient, and warm
weather is not so necessary to their success.
—41—
i
Novius (Vidalia) Cardinalis, Adult and Larva.
Much enlarged.
Cotton Cushion Scale
(Icerya purchasi)
The Cottony Cushion Scale
(Icerya purchasi)
Novius (Vedalia) Cardinalis
Little need be said of this scale as it is no longer a pest in Cali-
fornia, though at one time it appeared to be ruining the citrus in-
dustry, the large white covered insects making many groves look
as if they had passed through a snow storm, and ho treatment
would check it at all. Then the little lady-bird, about one-half the
size of a bird shot, was brought from Australia by Chas. Koebele,
to whom too much credit can not be given for his persistent advo-
cacy of getting a parasite for this scale, which finally resulted so
beneficially. These parasites increased astonishingly, and in a few
months had the scale under control. They have kept them down
to a negligible quantity since then, and we are always glad to
see a few, as the Novius (Vidalia) cardinalis will always find them
soon and will thus be kept from starving and dying out.
—42—
The adnlt female of the Mexican orange maggot (Anastrepha ludens)
(U. S. Dept. of Agrcl.)
Mexican Orange Maggot (Anastrepha ludens) . A. -Larva, B.-Anal segment of same,
C.-Pupa, D.-Head of same. A and E enlarged, B, D and C more enlarged.
The Mexican Orange Maggot
(Anastrepha ludens)
The Mediterranean Fruit Fly
(Ceratitis capitata)
The Citrus White Fly
(Ale yr odes citri)
These three fruit pests are the ones our state quarantine officers
are watching more closely than any coming in on foreign fruits
and trees. The first two have not yet, so far as we know, obtained
a foothold in our State, and only one or two very small infesta-
tions are known of the white fly. These last are being fought
persistently regardless of expense and effect on trees and plants,
and it is confidently expected that they will be exterminated in
a short time. They are decreasing every year. The adult is a
minute white fly, one-tenth of an inch long, looking as if it had
been sprinkled with flour, and the immature form is a flat, greenish
scale-like insect with habits much like the other scales, but nearly
transparent and of waxy appearance. It is less than one-sixteenth
of an inch long and lays very flat on the under side of the leaf.
Maggots and Puparia of the Mediteraneum fruit fly
(Ceratitis capitata).
It deposits the honey dew and the resulting black smut is very
bad. In Florida it is their worst citrus pest, and must be driven
out of California at any cost.
The Mediterranean Fruit Fly deposits its eggs in the fruit and
they hatch out into an army of white maggots just about the time
the fruit ripens. They soon work through the pulp and it rapidly
becomes decayed. The fruit drops to the ground and the worms,
which will curl up and snap themselves an amazing distance, at
once burrow into the ground where they pupate and soon emerge
as a fly.
They affect almost all kinds of fruit and vegetables except pine-
apples and bananas, which are the only fruit admitted from Hawaii
on this account.
The Mexican Orange Maggot has almost the same habits as the
Mediterranean Fly, and infests oranges, sweet limes, mangoes,
achras sapotes, peaches, guavas and plums. All of these fruits
from Mexico are excluded from California and Arizona.
These pests should be watched for very carefully in every orchard
and wherever fruit is found. If you find fruit or vegetables filled
with maggots, do not throw them away and thus give the worms
a chance to go into the ground and mature and start the pest here.
Wrap the fruit up to prevent their escape, and send to the nearest
Horticultural Inspector for investigation. It is a serious matter.
APHIS OR PLANT LICE
Woolly Aphis
( S chizoneura lanigera)
. Black Peach Aphis
(Aphis persicae niger)
Orange Aphis
(Aphis gossipi)
The aphis family is probably the most widely distributed and
most prolific of any plant eating insects known, and were it not
for many very active parasites, and the work of predaceous insects,
we should find it difficult to bring to maturity any plant life.
However, the above mentioned friends work hard for us and most
kinds of the aphis do us comparatively little damage.
We have aphis known as the orange, the green rose, the brown
or black, the melon, the black peach, the woolly aphis, and many
more of less importance.
The Black Peach, the Melon and the Wolly Aphis are the ones
most important for the fruit grower to control, as the care of
orange trees for other pests almost always subdues the aphis on
them. The Melon Aphis is now managed by placing colonies of
the common spotted and red ladybirds in the melon patch. They
can be obtained from the State Insectary. Ashes or lime placed on
the damp vines is recommended.
The Black Peach Aphis and the Wolly Aphis attack both the
top and the roots, the Black Peach Aphis attacking peach and other
stone fruit trees, and the Woolly Aphis attacking apple trees.
The Black Peach Aphis seems not to be seriously regarded in
the East, but on sandy soils of this County, it has caused much
alarm and some trees have been killed to stop it from spreading.
Wooly Aphis (Schizoneura lanigera Hausm) ; a.-root in-
jury by the underground form ; b. -wingless female;
c.-winged female. (U. S. Dept. Agrcl.)
Black Peach Aphis (Aphis persicae-niger)
The only remedy here seems to be a solution of potassium cyanide
placed in a trench around the roots of the tree, or carbon bisulphide
put about one foot below the surface, close to the tap root, and
either remedy is quite likely to kill the tree, though the cyanide is
least severe. In each case the top should be sprayed well with
krosene emulsion at the same time.
The Woolly Aphis is controlled by the application of wood ashes,
tobacco stems, or kerosene emulsion about the roots near the
tree, and the kerosene emulsion spray for the top. This treat-
ment is recommended by many authorities for the Black Peach
Aphis, but it is not efficient here for this species.
The swollen yellow bodies of the Orange and Rose Aphis, with
a hole in the top of each, show the work of the parasitic fly which
keeps them in control, and if any treatment is needed, tobacco
solution will do the work.
—46—
The Longulus Scale
This is a new variety, the origin of which no one seems to know,
and which infests only the citrus trees in a small territory in one
section of the County. It is described as somewhat like to the
Soft Brown Scale in some stages, and has been sometimes so classed.
It seems to rear but one brood per year which appear anywhere
from May 1st to August 20th. The young are much like those
of the Soft Brown Scale, but a little larger and more yellow at
first, and after settling, become more flat, a greenish color, and
more transparent than the Soft Brown Scale.
They first settle on the tender twigs and leaves, mostly on the
under side. By January the most of them move onto the twigs
and small branches and change to a mottled gray color. As they
grow, they become more convex, until at maturity they are a
long oval in shape and about one-fourth of an inch long at their
largest, with many much smaller, but producing young and appear-
ing to be adults. When close together, they often lap in regular
order like fish scales.
After the young are all hatched, the mother turns dry and brown,
loosens her hold on the tree and often drops off, leaving a white
powdery residue on the branch; very few old ones remaining on
the tree over winter. They are never found on the fruit.
They seem to require fumigation somewhat earlier than the Black
Scale, say from July 15th to Sept. 1st for best results, and sprays
have proved useless. There seems to be very little work of para-
sites on this scale.
Pear Thrips
(Euthrips pyri)
Citrus Thrips
(Euthrips citri)
Bean Thrips
(Euthrips fasciatus)
The thrips are very small, active, hopping and flying insects,
probably native to California. There are many kinds, of which
we will speak of a few.
The Orange Thrip is dark yellow, with a life term of about 20
days, hence are constantly being born and dying. They attack the
tender leaves and twigs of the orange early in the season, and
later the fruit, and the fruit is scarred in a peculiar manner. A
ring is formed around either or both ends and the lines radiate
—47—
from the rings, sometimes uniting them. Solid and irregular lines
and patches are also made.
The insect is of little importance in this County, but in some
other parts of the state is a very serious pest. The control measure
recommended by the U. S. Government investigators is a spray
made up of the following:
Work of Orange Thrip. Note peculiar arrangement of scars in
circles and radiating lines.
gallons of lime-sulphur solution (33° Beaume).
2 gallons black leaf (2^4% nicotine).
(or 14 fluid oz. black leaf 40).
200 gallons of water.
Thoroughly drench the tree with this spray, especially on the
outside. Apply three times during the spring months to save the
fruit and leaves, and once in the fall to save the fall growth.
—48—
The Pear Thrip in the region around San Francisco Bay attacks
pears, plums, prunes, etc., but as the insect spends eleven months
in the ground, thorough plowing and cultivation helps much in its
control. It attacks the leaves and scars the young fruit. The above
spray applied in March and again in April is recommended.
The Bean Thrip does much damage to beans and peas, attacking
the under side of the leaves.
Other varieties attack the orange bloom with but little injury,
but on roses, etc., in greenhouses, they have to be fought constantly.
Peach Twig Borer
(Anarsia Uneatella)
This borer is also known as the Peach Moth, Peach Worm and
the Bud Worm. It is a peculiar insect, the means of doing great
damage in some of the deciduous fruit regions of the State, and of
some importance in our County. It should be known, watched
for and guarded against carefully.
During the winter the little larva or worms are hibernating in
the thick bark at the crotches and about wounds in the trunk of
the tree. They are only about 1-32 of an inch long, and grow
before pupating to a length of ^4 to ^ of an inch. Their hiber-
nating place can be detected by little chimneys of bark pulp about
1-32 of an inch high erected at the mouth of each burrow. When
spring arrives they come out and bore into the swelling buds and
starting twigs, killing them. New grafts and dormant buds are very
apt to be attacked. In six weeks they pupate in curls of the bark
on the trunk and soon come out a moth of steel gray color and
quick movement. Three generations are hatched during the sum-
mer. The first from eggs deposited in the young twigs about May
10th. These bore into the pith of the twig and kill it, then later
enter the fruit about the stem and after injuring it considerably,
come out and pupate during June, July and August in the suture
cleft of the fruit near the stem. In a week the second moth ap-
pears depositing eggs on the fruit near the stem dent. In a week
these hatch out worms which eat into the fruit working there for
a month, then coming out to pupate again, the third moth appear-
ing in a week to deposit eggs in cracks of the bark from which
hatch the worms which at once begin burrowing, in the crotches of
the trees, the chambers with chimneys, in which to pass the winter.
Remedy: Lime-sulphur spray applied hot if possible, just be-
fore blooming time.
—49—
Peach Twig Borer (Anarsia lineatella). Little chimney at mouth
of winter burrow at crotch of branch.
Young twig showing entrance hole of Peach Twig Borer.
Young twig showing work of Peach Twig Borer.
—50—
The Rose and Berry Scale
(Aulacaspis rosae)
This scale is a very serious pest to the berry grower, and a great
annoyance to the rose lover at times.
It appears a dead white, on the canes of the bushes near the
ground, and looks much like splashes of whitewash thrown on them.
The scale pulled off, reveals the tiny red insect beneath. They par-
ticularly like loganberries and often ruin the plants.
The best remedy is to cut out the old canes as soon as done bear-
ing, and spray those remaining with kerosene emulsion, digging
the soil away around the roots to allow the fluid to penetrate to them
as the scale often infests the canes below the surface.
Twelve Spotted Leaf Beetle (Diabrotia soror)
Much enlarged.
Diabrotica Soror
This is the familiar green beetle with twelve black spots. It is
found everywhere, on all sorts of plants, and on all of them it does
more or less damage. The tender growth of the orange tree is
often attacked, freshly budded and young trees being especially
subject to them, but the lemon seems to be immune. The larva
lives in the ground and gets its food there. There are two ways
to control these beetles. One may jar or shake them off from young
—51—
trees in the early morning when sluggish, letting them drop in a
tared or oiled surface, or they may be poisoned with a spray of
arsenate of lead, 8 Ibs. to 200 gals, of water, or \y2 Ibs. of paris
green to 200 gals, of water.
The beetles occasionally do serious damage to melon vines.
Work of Diabrotica sorer on orange leaves.
The Coddling Moth
(Carpocapsa pomonella)
This the most troublesome pest of the apple, lives in the form
of larva, or pupa, during the winter, in the ground or in any shel-
tered place available, and on the arrival of spring, assumes the form
of the adult moth and begins laying eggs, mostly on. the upper sides
of the largest of the new leaves. The eggs are flat, transparent,
and about the size of a pinhead.
—52—
The trees are now beginning to blossom and as the larva mostly
enter the fruit through the blossom end, the poison spray is used,
applied from above to fill the cup in the blossom end or calyx before
it closes, as it will do when the fruit is well set. As the bloom is
often not even, this spray may have to be repeated to poison all the
cups, and even a third spraying may be necessary. As the eggs
begin to hatch, spray again to kill all the worms possible, as some
will enter the fruit at the side, not through the calyx, and this spray
may be repeated in three weeks, and even a third time with profit.
These sprayings should wet the whole tree thoroughly with a very
fine spray, but be stopped long before dripping begins, as if too much
is used the liquid runs together, is not so effective, and is more
liable to burn the foliage. This early treatment is the important
one as one worm destroyed now prevents the breeding of one or
two hundred later. This should get about all the worms but if some
escape and pupate later, forming moths to deposit eggs, spray again
in midsummer when these eggs are hatching. The condition of
moths, larva and eggs are best watched by placing cocoons in a
screen covered box, as the aggs are hard to find on the leaves.
The best spray is the arsenate of lead, as it adheres to the leaves
better and longer and is less liable to injure the foliage than paris
green spray.
All sorts of rubbish in which the cocoons can winter should be
religiously cleaned up, in and around the orchard, and places in
which infested apples are stored should be made tight enough to
prevent the worms escaping to breed again in the orchard. Win-
dows even should be screened.
Peach Root-Borer
(Sanninoidea opalescens)
This is a very injurious insect in the Santa Clara Valley, and of
course liable to be brought here on nursery stock at any time. Stone
fruit trees are its prey, and it can always be detected by the mass of
gum exuding from the tree near the base where it is working. They,
of course, injure the tree in proportion to their numbers, sometimes
girdling and killing it. The usual method of treatment is to dig
out the worms, probe all the burrows possible with a wire, and
fill them with coal oil, then apply a thick whitewash made by slack-
ing 16 Ibs. of lime and pouring in 1 gallon of 16° Beaume crude oil
while doing so.
If the worms are very numerous, the trees are likely to be much
injured in getting them out. A blacksmith's hook-pointed hoof knife
—53—
is a good digging tool. A treatment recommended by our State ex-
periment station is to dig away the soil about the roots of the tree
down to the crown and fill up with loose soil, then pour on this loose
earth, carbon bisulphide from a half ounce to two ounces, according
to the size of the tree and number of worms, and at once throw up a
mound of loose earth about the tree. Wet earth will retain the bi-
sulphide gas too long, to the injury of the trees, therefore if rain
comes within twenty-four hours, take away the mound of earth.
The Corn Worm
(Heliothus armiger)
This very common pest comes from eggs deposited by the moth
on the corn silk almost as soon as it appears, and the resulting larva
crawls to the young ear and begins its work.
The remedies are to poison the moth with molasses mixed with
with arsenate of lead or paris green, in dishes fastened about the
heighth of corn ears, or better yet, plant an early crop of corn which
will get the worms before the main crop is ready, then before the
larva leave the ears to pupate in the ground, cut this crop and de-
stroy it, or feed it green, thus saving the later crop.
Fuller's Rose Beetle (Aramigus fulleri)
Fuller's Rose Beetle
(Aramigus fulleri)
This is a grayish brown bettle somewhat more than three-eighths
of an inch long. It tapers toward the head and has a short snout.
They can be found on the under side of the leaves of trees or the
forks of the branches, or clinging to a twig. They feed mostly at
night, keeping quiet and much in the dark during the day. They
are very injurious to strawberry plants, and new stock must be
obtained frequently from uninfested districts to raise them profit-
ably here. No plants for new beds should be taken from beds in
—54—
this county which have not been renewed within one year with
plants from an immune district, some place where severe frosts keep
out this pest. There is practically no remedy for infested plants.
The beetles work on young orange trees also, and especially on
Young orange foliage, showing work of Fuller's Rose Beetle.
starting buds of nursery stock, where they will make tatters of the
new leaves and destroy the tender growth. The larva feed on tree
and plant roots in the ground, doing much damage. The beetles
can be kept out of the trees by bands of tanglefoot or cotton bat-
ting placed around the trunks.
—55—
Eel Worm (Nematode)
Effect on root and much enlarged eggs
at different stages, found in roots.
Potato Eel Worm (Heterodera radicicola)
The Eel Worm
(Heterodera radicicola)
These, and allied Nematode worms, are doing much more damage
in the coast and mountain states than most growers are aware of.
The fact that they seldom or never kill a tree or actually destroy
a potato is probably largely responsible for this. The insect is a
microscopic worm which lives about ^ to ^4 of an inch beneath
the surface in plant roots of all kinds. We find its work in the
roots of all kinds of garden plants, citrus and deciduous trees, and
especially potatoes. These last show it by warts appearing all over
the tubers, the skin even on these warts, not being much roughened,
and on cutting the potato, dark specks will show just under the
skin. The infested tree and plant roots are much misshapen by
warts or swollen to shapeless masses, according to how badly they
—56—
are infested. In plants the vitality is so lowered that their cultiva-
tion is profitless, and hairy root on deciduous trees and chlorosis
of the citrus trees are attributed to its influence. The infestation
can be located with certainty only by examining the roots, but
when found to any serious extent it cannot be mistaken. No
Nematode galls on cucumber root.
remedy is known for it, and we can only be careful not to plant
infested potatoes or trees, or use infested land for trees or plants
liable to it. Infested land can be used for grain, and if beets are
planted in it and pulled and destroyed when half grown, before the
mature worms escape into the soil, its condition is said to be much
improved.
—57—
Potato Worm (Potato Moth, Tuber Moth)
(Phthorimaea operculella)
This is a serious pest, perhaps the most serious pest of the potato.
It is reported all over California south of Sacramento, and though
known in the middle west, does not seem to be prevalent in states
bordering on ours.
Cross-section of potato showing tunnels just under the skin made by tne
Tuber moth (Phthorimaea operculella). This is but a mild infestation.
The worms infest not only potatoes, but other plants of that
family, tobacco, "sodom apple," and nightshade.
The moth is grayish brown in color, about one-third of an inch
—58—
long, with well fringed wings. She deposits very small pearly white
eggs, on the tubers when exposed, either before or after digging,
or when stored in the bins or sacks, the larva entering about
the eyes or in wounds. They also hatch and enter the growing
stalks at the base of the leaves. The larva are about one-
twenty-fifth of an inch long, white, transparent, with black heads,
and they grow to the length of three-quarters of an inch, when their
heads and adjoining parts of the body are brown, shading towards
the rear to cloudy white or pink. When hatched, the worm at once
enters the potato and lives there just under the skin as a rule, but
also boring through any part of it, for about six weeks, when it
comes out to pupate, at the mouth of the burrow, in a skin depres-
sion, or any sheltered place in the vicinity. Often they lodge in the
sacking in which potatoes are stored, and the moth appears in two
or three weeks. If the eggs are layed on the stalks of growing
plants, the larva bore into the stalk and work down just under the
skin into the ground, where they leave the stalk and enter the tubers,
sometimes working some distance through the soil to find them.
The affected stalks show the burrow plainly under the skin, as its
contents are nearly black, and the stalk soon wilts.
In an infested field, these wilting stalks should be looked for and
cut out and burned or submerged in water as soon as possible, as
the worms may thus be prevented from entering the tubers. All
growing potatoes should be kept well covered with soil by hilling
up well, which will require rows to be forty inches apart, and the
land should not be cloddy or opened by cracks to allow the moths
to get to the tubers and deposit eggs on them. No potatoes should
be left in the field, especially at night, unless in tightly tied sacks,
and then the same sacks should not be used for storing them, as the
moths are sure to deposit eggs on them if any are about. The
tubers should not be covered with green vines as the vines are very
apt to contain worms, and it is often best to cut and destroy vines
before digging the tubers. After digging, the tops and weeds,
especially nightshade, should be at once cleaned off the land and
destroyed. Weeds and nightshade on adjoining land should also
be destroyed.
When the potatoes are to be stored, if their infestation is sus-
pected, soak them for 36 hours in as cold water as is obtainable.
This thoroughly destroys the worms and will not injure the po-
tatoes if the water is below 60°.
If the worm shows after the potatoes are stored, make the storage
—59—
room tight and place on the tubers a dish containing \y2 to 2 Ibs.
of carbon bisulphide for each 1000 cubic feet of space enclosed, and
repeat the dose as often as moths appear, usually four or five times
will not be too much to exterminate them. The bisulphide gas will
penetrate the sacks and save the crop if the bin is tight. The gas is
explosive ; keep fire away from it.
Infested potatoes should never be used for seed, nor infested
land used again for potatoes the next year. Waste potatoes should
be burned, not buried, and if fed to hogs, cooked or soaked well
first.
Alfalfa Weevil (Phytonomus posticus) Adult.
Six times actual size.
Alfalfa Weevil
(Phytonomus posticus)
This pest, which we have so far succeeded in keeping out of Cali-
fornia, is a very serious menace to the alfalfa grower as evidenced
by its work in Utah, Idaho and Wyoming, where they often ruin
the first two crops and seriously injure the third.
The insect is one of the snout beetles, when mature is from one-
eighth to three-sixteenths of an inch long, brown, flecked with gray
or white ; growing older, it becomes darker until almost black, still
with the gray mottling. They are very active and ready to fly,
which they can do for long distances.
The larva when hatched is very small, white and footless, later
they become green, are always curled up, and when they pupate,
form a spherical cocoon of coarse fibers, from which the adult
emerges. In May they are in all stages of development on the
plants, and the adults will live a year. The adult shows up on the
first cutting of alfalfa in the spring and soon begins depositing eggs
in the stems of the plant to the number of two or three hundred.
The larva soon hatch out, very small at first, getting to work at
once on the plants and leaves. As summer arrives, they hibernate
under alfalfa, weeds, rubbish of all kinds, pupate in their cocoons,
—60—
and hatch in ten or twelve days. From about June they are all in
the adult stage, very active at first, and easily carried by the wind,
and after hibernating, by the transportation of hay, seed or almost
anything in which they can hide.
Alfalfa Weevil (Phytonomus posticus)
Larvae and eggs on plant.
and larva enlarged
No means are known to check them when once established, and
our only hope to escape them is to detect them at once when they
arrive and kill them, infested plant and all, by the best means
available. The State Horticultural Commissioner advocates piling
straw on them and burning them. If you find anything suspicious,
notify the State office at once, and if the area is small, apply the
fire thoroughly.
—61—
Grape Phylloxera
(Phylloxera vastatrix)
This is the grape pest feared above all others, not only in Cali-
fornia, but everywhere that the vine is much cultivated. It is a
plant louse, but it lives and works in several forms, sometimes on
the vine above ground, but mostly on the root, and it requires two
years to complete its life cycle. There is one form having wings to
aid in spreading the infestation, which, however, is mostly done
through shipping and planting infested nursery stock. Grape boxes
may carry it at picking season, also anything coming in contact
with the vine, soil, root or fruit. The injury done by this pest is
mostly on the roots, which show small swellings, decay and death,
and then of course the whole vine dies sooner or later, but there is
much difference in the resistance of vines to the insect.
Some of our native vines are immune to the Phylloxera, and this
is likely to save our grape industry, for if the improved varieties
are grafted on to these immune roots, we need fear the pest but
little, and eventually we hope that a strain of vines practically im-
mune will be developed.
The indications of phylloxera are a decreased growth of the leaves,
small bunches of grapes very lacking in sugar, yellow coloring and
dropping of the leaves. The infested vines must be dug up, the
land used for other crops for two or three years, and when replanted,
resistant vines used.
A strict quarantine should be maintained against any infested dis-
trict and all incoming nursery vines from anywhere should be care-
fully inspected to prevent new infestations of this pest.
The Cankerworm
(Alsophila pometaria)
This pest, also known as the measuring worm, is the larva of
a wingless moth which crawls up the tree in the fall and deposits
about the twigs her masses of eggs which hatch in the spring and
feed on the new leaves just putting out, sometimes defoliating the
tree to its injury for more than a year.
Tree tanglefoot, the sticky coating of flypaper put about the trunk,
will prevent the moths climbing the tree, if watched and kept fresh
and sticky. It should be kept on from Nov. 1st to Jan. 15th.
—62—
June Bug (Lachnosterna sp.)
June Bug
(Lachnosterna sp.)
The larva of this beetle are the white grubs so well known in
our gardens. They live in the ground about two years, when
after a season of pupation in the spring, they assume the adult
form of medium sized brown beetles, and feed on the leaves of
fruit trees and similar growth for a short time, during which they
deposit their eggs in the soil and die. Their work on small trees
is often quite injurious while they last.
Poisoning the foliage with arsenical sprays is the best means of
combating them.
X '**>
Wire-worms, larva and adult.
Wire Worms
(Elateridae)
These long, slim, brown, hard shelled worms, found a few inches
below the surface in grass or grain land, are not usually very
injurious, but when the land is used for trees or some new crop,
and the old food plants are gone, they may do much harm. Young
fruit trees, set in old grain fields, are sometimes attacked by them
just below the surface and much injured, and even girdled and
—63—
killed. They also attack walnuts planted in nurseries, penetrating
the shell and eating out the meat of the seed nut, also young beet
plants and newly planted beans. The larva lives in the ground
from one to three years before assuming the adult form, which is
the click beetle, which throws itself sharply into the air when laid
on its back.
In cases of injury to trees, the worms might be diverted from their
work by growing grain or other favorite food between the rows to
furnish them their usual form of food, and green alfalfa might be
placed about the trees to temporarily divert them.
Plat Headed Borer (Chrysobothris femorata)
The Flat-headed Borer
(Chrysobothris femorata)
These borers infest nearly all deciduous trees, and also berry
canes, doing more or less damage. Protecting the parts attacked,
the trunk or main stalk, from sunburn, is a preventive measure,
as they always seek sunburned or injured spots. Shade young
trees with two shakes stuck in the ground side by side, and white-
wash older trees, putting some sulphur and soap in the whitewash.
If already in the trees, dig out the dead bark and seal up with
grafting wax. Cut all affected berry canes and cut and burn old
ones as soon as done bearing. This will help also to check the
white rose scale if you have any of it.
Bean and Pea Weevils
(Bruchus sp.)
When the seed peas or beans have "bugs" in them, or the holes
where bugs have been, place them before planting in a tight box
(very tight) and set on top of the seed a shallow dish containing
carbon bisulphide, 1 oz. to each 10 cubic feet of space in the box,
and leave it for six hours. This drug and its gas are explosive, so
keep fire away. It will form gas which will kill the weevils, but
the liquid should not touch the seed. If the land grew "buggy"
peas last year raise a few very early peas first to be destroyed
when nearly mature and the weevils get onto them.
Cabbage Aphis
(Aphis brassicae)
This aphis or plant louse is often very bad on cabbages, but a
spray of tobacco extract (1 part of tobacco extract to 50 of water)
will control it well. The State Insectary will send you a parasite
for it if application is made. Before planting, dip all young cab-
bage plants in a solution of whale oil soap, 1 Ib. to 5 gallons of
water.
Norfolk Pine Scale (Eriococcus araucariae)
Norfolk Island Pine Scale
(Errococcus araucariae)
This is a pure white oval scale, much rounded over the top and
located at the base of and on the spines or leaves of the Norfolk
island pine. On crushing, they yield a yellowish, red fluid, and
seem to resist oil and caustic sprays ; but good results are reported
from the use of resin wash which seems to kill them.
—65—
Pear and Cherry-slug (E. cerase) a-larva, b-adult.
Pear and Cherry Slug
These insects do considerable damage to the foliage of pear
and quince trees, eating out the leaf pulp and leaving only a skele-
ton of parts of the leaf attacked. Finely powdered lime or road
dust, sifted on to the trees, easily control it. Dry soil shoveled
over the trees from between the rows, often answers as well as
anything.
The Cabbage Worm
(Pontia rapae)
In gardens, spray for this and similar worms, with tobacco extract
(1 to 50). The parasite Teromalus puparium is said to be very
efficient for these worms, and a colony of them from the State
Insectary would well repay a trial.
The Tent Caterpillar
(Malacosoma disstria)
Wherever deciduous fruit trees grow these insects are found at
times. They live in web nests, often very large and enclosing
several branches, and eat the leaves on the part of the tree nearest
them, often completely defoliating it.
The eggs are laid by a moth in summer, in clusters around the
outer twigs of the tree, but do not hatch until the following spring,
and when the trees are pruned in the winter they should be looked
for, cut off, and all prunings burned. Any nests of the worms
should also be cut out or burned on the tree with a torch.
The California Tussock Moth
(Hemerocampa vetusta)
This pest, like the tent caterpillar, is hatched in the spring from
an egg layed in the June before, and it attacks both leaves and
fruit. The moth is practically wingless, and can be kept from
climbing the trees by the tanglefoot bands. When beginning to
feed, the worms can be jarred from the trees and prevented from
—66-
Tussock Moth (H. vetusta) a-f emale moth, b-young catapillar, c-f emale pupa,
d-male pupa, e-larva on leaf, f-male moth.
crawling up again by a steep mound of loose earth built around
the foot of the tree. The tanglefoot will come in well here, too.
These worms are intermittent in their infestations, indicating that
some parasite cleans them up when it finds them.
False Chinch-bugs
(Nysius augustatus)
Squash-bugs
(Anarsa tristis)
Harlequin Cabbage-bugs
(Murgantia histrionic a)
These are three insects which work in a very similar manner
and all have the peculiarity, unlike others of their class, of emit-
ting a disagreeable odor when crushed. They all have a sharp
proboscis by which they suck the juices from the plants. This
beak can be seen on turning the bug onto its back. They do not
have a larval or grub form, the young being of similar form to
the adult/ but without wings, and of course, smaller. They attack
all varieties of fruits and vegetables.
The False Chinch-bugs often seriously injure young orange trees,
and the others are a bad strawberry pest. The young can be killed
with kerosene emulsion. Keep all weeds and rubbish cleaned up
on your land as the adults sleep in this material over winter.
—67—
Some such piles of rubbish or straw might be left in which they
would collect, then burn them. When they show up in the spring,
start some extra crop which they like. When they collect on that,
destroy it and the bugs. They are practically immune to poisons
as they do not feed on the surface of the plant.
M^i^-.^tf^p
.<
Cut-worm Moth (Noctuidae sp.)
Cut Worms
(Noctuidae sp.)
These troublesome insects are of various species, but all have
similar habits, which are pretty well known everywhere.
They remain in the ground just beneath the surface during the
day, coming out at night to cut our growing plants near the ground,
to crawl up the trees and feed on the leaves, and the allied species,
known as the Army Worm, goes in droves across the country, de-
vouring everything in its path. '
The adult forms of all these worms are night flying moths, and
these may be caught to some extent, with lantern traps ; a dish on
top of a stake having coal oil or some sticky fluid in the bottom
and a light just above it in the center, but the main dependence
must be placed in poisons for the worms themselves.
For garden plants, like tomatoes, cabbages, potatoes, etc., put
at the base of each plant a tablespoonful of brain into which paris-
green has been thoroughly mixed in the proportion of 1 to 50,
and then wet until it will stick together, with slightly sweetened
water. The worms like this better than the plant. Lay a board
12 inches wide on the ground in the garden and leave it over
night. In the morning you will find many worms under it which
can easily be killed. This is an excellent trap for them.
A band of tree tanglefoot or cotton batting about the tree trunks
will keep down those which climb trees.
The Army Worm is a different matter. On first discovering
them, pile inflammable material on them and burn it, if the army
is not too large. If they have begun to move, a furrow plowed
across their course and kept constantly wet with kerosene has
—68—
been used with some success if persisted in. But they generally
march with little check until they are ready to pupate. How-
ever, parasites and disease find them, and their numbers are de-
creased so that the second year seldom produces them in alarming
numbers.
The native California Lady-bird (Hippodamia convergens)
Larvae and bursting pupa.
Native California Lady-birds
These native Lady-birds are of the utmost importance to the
fruit and plant grower as they are constantly preying on the various
young scales, mealy bug, and especially the aphis. Every one
should learn to recognize the larva and pupa, as well as the adult
beetles and protect and preserve them all as much as possible.
The larva are so peculiar in appearance that once known they
willl never be mistaken for anything else. They are as repulsive
and ferocious looking as the adult is the opposite. They reach a
length of y% of an inch and vary from brown to black in color,
some having bright red and yellow markings. They are nearly
an eighth of an inch wide in the middle and taper nearly to a point
at each end. They bristle all over, especially about the head,
with short, black, coarse hairs. Some other Lady-birds, equally
beneficial but not so numerous, have larva covered with tangled
threads of pure white. Many of the native species are collected
in the mountains, where they go to hibernate in the winter time;
and are preserved in cold storage at the State Insectary to be
distributed at the proper season to melon growers and others who
request them for the control of aphis, and while no other species
have accomplished the spectacular performance of the Australian
variety (Novius cardinalis), which saved the citrus industry of
California some years ago from the White Scale, yet in their quiet
way perhaps they are benefitting the growers of the State just
as much and we must protect them in every possible way.
—70—
FUNGUS DISEASES
Gum Disease of Citrus Trees and Treatment
First we find there are two distinct forms of this disease. The
first and most prevalent is that in which the gum oozes from under
Citrus Gum Disease; showing appearance of trunk affected.
the bark at, or just above, the ground. It first appears like a thick,
syrupy matter, crystallizing after being exposed to the air. The
first symptoms are a slight swelling of the outer bark, caused by
the congestion of tlje sap, which must either break out or be forced
—71—
between the outer bark and cambium layer or inner bark. When
this occurs, the cambium is destroyed as far as the congested sap
extends, but fortunately the bark bursts under the pressure before
the poisous syrupy matter extends very far about the body of the
tree. This reduces the pressure until the affected parts dry up,
then if the cause is not removed, the same trouble will occur to
the heretofore unaffected parts, and eventually girdle and destroy
the tree.
Causes of this form of Gum Disease : Extreme moisture or
drouth, clay or hard pan which hold up an excess of water, sand
or gravel sub-soil, especially if underlayed with clay or hard pan.
All of these conditions will cause this form of gum disease.
Treatment — If possible never allow the soil to get too wet or
too dry. If underlayed with clay or hard pan, blast through and
loosen it up if it is possible. Where sand and gravel exist I have
known good results from digging one or more trenches, 2^ feet
deep between the rows, and rilling with manure and trash, to
serve as a drain and nourish small roots. In addition to the above,
remove the earth from about the trunk so as to leave the top
of the large roots exposed, then use a horseshoer's knife with a
turn at the end of the blade. With this a groove can be cut through
the bark from the roots to the large branches. If a small tree one
groove is plenty, if a large tree cut grooves about two inches apart,
then paint all of the body with pure neats foot oil. If a very bad
case I would recommend cutting back the branches quite severely.
Trees budded on the seed stalk not less than six inches above
the ground are usually less liable to this disease than those budded
lower, and the higher the bud the better, as the seedling wood
is much less liable to gum disease than the bud, as a rule. Care
should be taken, in any case, not to plant the tree too deep. Some
advocate planting so shallow that the crown roots are right at
the surface.
Scaly Bark of Citrus Trees
This disease generally appears first on the large branches near
the body of the tree, but in severe cases the whole body is affected.
It first appears like small warty eruptions. Small quantities of
gum ooze from the warts. This dries up and the eruptions ap-
parently heal, but are immediately followed by others which spread
quite rapidly, causing the outer bark to crack and scale up, hence
the name "Scaly Bark." This disease is considered by many to be
contagious.
—72—
Treatment — If a very bad case, I would advise the removal of
the limb or branch, but ordinarily this disease can be cured by
scraping off all of the rough, scabby bark, then treating with a
strong solution of caustic potash, one pound dissolved in six gal-
lons of water. Spray or brush the affected parts thoroughly with
this solution three or four times during the year. I have also
seen good results from the use of coal tar and carbolic solutions
used in place of the caustic potash.
Chlorosis
(Lack of Nutrition)
In this trouble the leaves become yellow and pale, and the
mottled appearance of the leaves often goes with it, though the
latter trouble alone seems more easily remedied than the first, and
when affecting young leaves and grafts will usually disappear in
a short time if proper care is given the tree.
The sub-soil when very light or covered by a hard pan seems
often to cause Chlorosis, and sometimes the Nematode Worm
(similar to the potato eel worm) is blamed as the cause. Each
case should be carefully investigated, the cause found and cor-
rected. It is simply lack of proper nourishment in the tree.
Damping Off of Citrus Seedlings
(Rhizoctonia fusarium)
This is the shrinkage and decay of the stalk of citrus seed-bed
stock and causes much loss every year. It is caused by an over wet
soil. Seed beds should have one inch of clean sand on top with
heavier soil beneath, and then only sufficient water used to give
the plants good growth. Beginners should dig into the soil fre-
quently to ascertain its moisture, and not water whenever the top
sand gets dry.
If the "damping off" begins, stop watering at once and allow
the bed to get as dry as the plants will stand. Then with a long
toothed rake loosen the surface thoroughly, raking and cross-
raking, even if some plants are disturbed and killed. This breaks
up and destroys the fungus growths in the soil and will save many
of the plants not yet attacked,
Frost Protection
With the citrus grower this is a very live and important sub-
ject, as very few places in Southern California escape an occasional
—73—
frost. The best appliances for this work are the sheet iron fire
pots for burning petroleum, of which there are several kinds, each
having its advocates and admirers.
The pots should be filled "as directed," and placed in the grove
when cold spells are to be expected, usually one to a tree, set,
however, in the open space between the trees, and an extra row
along the east and north sides of the grove, and as a general rule,
when the temperature at 2:00 a. m. drops to 26°, go through and
light them as quickly as possible. This method has saved hun-
dreds of thousands of dollars to the orange growers in California.
Wither Tip
(Colletotrichum gloeosporioides)
The effects of this disease, in a general way, consists in a spot-
ting of the fruit and leaves and killing back of the twigs, and an
attack upon the young newly formed fruit causing it to drop.
It has increased considerably in the last 4 or 5 years, and is, no
doubt, to some extent blamed for dying tops due to some other
trouble. The distinguishing mark of the true wither tip is the
appearance of minute black spots on twigs and dead portions of
leaves, and a distinct yellow line on these leaves dividing this
dead brown leaf surface from that which looks green and healthy.
Under a good pocket glass these leaf spots show as small upright
fungus growths all over the surface. The disease with this ap-
pearance is very common, showing more or less on most dead
citrus twigs, and the minute spotting of lemons is often "laid to
its charge."
Many expert pathologists believe that the disease is never serious
unless the trees have been weakened by some other cause, and
the work of Nematode Worms is mentioned as one of the causes.
However, others think it more serious, but spraying with Bor-
deaux Mixture, or some form of blue vitriol solution is about the
only remedy suggested and of course any treatment tending tc
promote vigorous vitality in the tree would be proper.
Florida Die Back
This disease begins to show itself in little blisters or swellings
on the tender twigs, just a little puff on the twig ^4 to ^ of an
inch long and not at all discolored. On cutting open, these blisters
will show a pocket of gum, and the twig soon begins to wilt and
the leaves drop off. Also often some very large dark green leaves
—74—
will start in the middle of the tree, giving it a very thrifty look.
A brown, corky growth soon comes on the affected twigs, looking
like a fungus growth and covering a large part of the surface.
After the leaves have fallen, a large number of extra buds start
on the branch still living, and a multitude of twigs start from
them forming brushy tufts through the tree. The fruit is small
and pale in color, and has an insipid sweetness, with no acid
qualities. The rind shows dark brown spots from which radiate
cracks and splits in the fruit, and these splits often run in every
direction. The disease seems to be the result of uneven growth;
too much manure (nitrogenous or organic) applied after the vitality
of the trees has been much reduced or when growing in a light
soil, or the tree has suffered for water in a porous soil which dries
out quickly, the irrigations being too far apart, and this porous
soil may lie beneath a dark heavy surface soil.
The remedy is to keep the condition of the tree as even as pos-
sible by fertilizing and irrigating frequently and lightly.
—75—
REMEDIES FOR INSECTS AND DISEASE
Fumigation
Fumigation with hydrocyanic acid gas has become the main
reliance of the citrus fruit grower to preserve his trees from the
attacks of the various scale pests, and although the cost is higher,
probably twice that of spraying, the results are so much superior
and more lasting that in the end it is the cheaper method. These
superior results are due to several reasons : First, the gas, kept
about the tree for some time by the enclosing tent, completely
envelops and penetrates every part of it, while the spray, even
with the best kind of application, fails to touch all parts of the
tree owing to the thick foliage, which on the citrus trees is always
present. Even with defoliated trees it is difficult to reach every
part with spray, and it is seldom done in practice. We have yet
to find any insect attacking the citrus tree, except the red spiders
and similar mites, which are not as well, or better, reached by
the gas than by any spray which will not harm the tree, though
the thrips, owing to their flying abilities, are not well controlled
by fumigation, and the cheaper spray, more often repeated, has
secured the best results. Another point in favor of the gas treat-
ment is its better effect on the tree itself.
All growers know that too frequent spraying will kill many of
the tender twigs and lower the vitality of the tree, as might be
expected to result from keeping a film of oily or soapy material
on the young growth, and especially on the leaves where are located
the breathing parts of the plant. One of the principal causes of
injury from the Black Scale, Mealy Bug, and White Fly is the
stopping of the leaf pores by the honey dew secreted by these
insects and the accompanying smut growth, and this condition is
not materially improved if, to destroy the scale, we apply another,
perhaps equally harmful coating, to the foliage. In comparison
with this checking of tree growth by the sprays, we have only
to note the considerable stimulation of growth usually shown by
the trees immediately after fumigation, to decide which benefits
the tree most, aside from the help derived from the more complete
destruction of the scale.
—76—
FIG'S 2-3-4— Successive stages in placing a tent over a tree with poles.
FIG. 6-A tented tree, showing method of securing the Distance around the bottom
of the tent by means of a tape attached to an iron rod.
FIG. 7— Dosing a tree. FIG. 8— Removing a tent from one tree to another by means of poles.
(Bureau of Entomology, U. S. Dept. of Agriculture.)
77
Of course, too strong a dosage of gas will produce injury as
well as too severe spraying, and judgment is required, not only
to get a dose rightly proportioned to the size of the tree, but to
properly adjust it to conditions of the atmosphere and temperature.
A damp atmosphere makes the tree more susceptible to burning
by the gas, and of course if fog or rain makes the tree really wet,
the fumigation must stop. A high temperature has a similar effect,
and a combination of a hot night and a damp atmosphere is very
dangerous. The same is true of a temperature below 32°. Fumi-
gation can be done safely only in a dim light, and the night's work
should never begin in bright weather sooner than sunset. Very
bad burning of trees has often resulted from starting work too
early in the evening or continuing too late in the morning.
We can not account, at least not fully, for some other unex-
pected results in fumigation work, and we are obliged to confess
that we do not fully understand this chemical process and its
adaptation to our needs yet. However, we know enough about it
to make decidedly the best killing of scale by its means, and with
the least harmful results to the trees of any process we have.
How to Fumigate — First, tents must be provided large enough
to cover the largest of the trees to be treated. Where there are
several sizes, if some of the tents are large enough for the biggest
trees, smaller ones can be used for the balance, or if only a few
trees are too large for the tents at hand, these may be covered
by using two or more tents, lapping the edges and closing the
joints as well as possible. Sometimes three or four tents are
applied around a very large tree, and one as a cap over the top.
The joints of the tents in such cases, will of course, leak gas some,
but surprisingly good results are obtained with careful work.
The tents now universally used in this County are simply an
eight square sheet of sufficient size, made of various kinds of cloth,
but mostly canvas, from 8 oz. to 10 oz., or drill of about 6 oz. in
weight, double sewed, and with two rings attached by pieces of
rope, firmly sewed on at two adjacent corners, by which the tent
is drawn over the trees.
One or more marks are painted directly across the canvas on
which each foot in length is shown by a short cross mark, each
of which is numbered like a tape line, so that when the tent is
on the tree this mark acts as a measure, showing the distance over
the tree. These marks are made with very heavy lines and large
figures so as to be easily read at night.
—78—
The rings are slipped onto the tops of two poles, from 16 to 20
feet long, the butts of which are placed on each side of the tree
to be covered. Two ropes, the length of the poles, or longer,
are attached to their tops; the other end of each rope is held by a
man with his foot on the butt of the pole ; the men pull their
ropes, the tops of the poles rise bearing the front edge of the
tent, which is carried over the tree and the length of the pole
beyond it, thus covering the tree. A tape measure is passed around
the covered tree, giving its circumference ; the marks on the canvas
show the distance over the top, and from a prepared table or sched-
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Dosage Schedule No. A, for sodium cyanid. (U. S. Dept. of Agriculture.)
ule of dosage, the operator can see at a glance just howr much
cyanide to use for each tree thus measured. This is the latest
improved system known as the Woglum System.
The "dose" of sulphuric acid is diluted with water and placed
in a deep earthen pot, placed under the tent by raising one side,
the cyanide is dropped into it, the tent closed quickly, and left
on the tree one hour.
The Dose — The chemicals used are either cyanide of potassium
or cyanide of sodium (the latter usually now as it is cheaper and
gives the best of results) from which the gas is liberated by emers-
—79—
ing it in diluted surfuric acid. Potassium Cyanide requires for each
ounce, one fluid ounce of acid diluted with three fluid ounces of
water. Sodium Cyanide for each ounce requires ll/2 fluid ounces
of acid diluted with 2 fluid ounces of water, but as ^4 of an ounce
of the sodium is as strong as an ounce of the potassium, and it is
a little cheaper per ounce, a saving is made in using it. This
refers to the best grade of each chemical and it is important to
Method of Marking Tent.
use the best. With cyanide of potassium the best is known as
99% ; with cyanide of sodium it is called 129%, and the sulphuric
acid is known as 93%.
These chemicals obtained from the general drug trade are not
always sufficiently pure, and the Horticultural Commissioner's office
will always be able to inform anyone how to get pure chemicals.
We can also furnish the tables or schedules of dosage which will
be correct.
—80—
One hundred cubic feet of tented space requires 1 oz. of pot-
tasium cyanide or y^ oz. of sodium cyanide for a basis dose, which
is used for most fumigation work, and is. known as Schedule No. 1
for potassium cyanide and Schedule A for sodium cyanide, and
they can be varied for any special infestation or condition of tree
or atmosphere. For instance, a bad infestation of Mealy Bug- would
require \l/2 this schedule dose.
The residue remaining in the pots after treatent of each tree
should be a green liquid, not very poisonous, but if lumps of cyanide
remain in it undissolved from wrong proportioning or poor ma-
terial, any animal or fowl eating it would be poisoned, and burying
is the better plan for its disposal if the work is done near houses
or barns. Care should be used not to drop any cyanide in handling
it for the same reason. Operators should very carefully avoid in-
haling the gas also, as it is very poisonous.
When to Fumigate
If the trees have only Black Scale, fumigate from September 10th
to February 1st, and that time is as good as any for the other scales
and bugs except the Longulus Scale, which seems to require treat-
ment as early as August 15th as noted in the description of that
scale.
Insecticides and Sprays
1. Lime Sulphur:
Quicklime -. 33 pounds
Sulphur _ 66 pounds
Water 200 gallons
Sift sulphur through box with screen bottom into boiling tank
with 50 gallons of water. Add the lime and boil 45 minutes to
one hour. Stir frequently. Strain through cheese cloth or burlap
and dilute to make 200 gallons. If extra lime is desired strain in
milk of lime when spray is ready for use.
l*/2. Self-boiled Lime Sulphur:
Fresh stone lime (not air slacked) 32 pounds
Flowers of sulphur 32 pounds
Water to make 200 gallons
Place the lime in a barrel and pour on enough water to cover
it. As soon as it begin to slack, sift in the sulphur so that all
lumps will be broken up fine. Stir constantly, and add water
slowly to make a thick paste, then, as soon as the slacking is com-
—81—
pleted dilute to a thin paste, then to a liquid thin enough to strain,
then add the balance of the water and use.
The heat of the slacking- lime will boil the mixture for several
minutes and hot water is better for thinning the paste so as to
prolong the period of heat, which is necessary to dissolve the
sulphur.
Rex lime sulphur spray sold ready prepared has produced excel-
lent results for Red Spider on citrus trees. It costs about eighty
cents per one hundred gallons when diluted to a 3% solution for use.
The Ortho spray is also well recommended for the same pur-
pose and costs somewhat less.
2. Commercial Lime Sulphur:
If of 32° Beaume dilute 1 to 9. If 36° dilute 1 to 11. Either
of the above for San Jose and other armored scales to be applied
during the dormant season, preferably in early winter or early
spring. For Peach Moth, as the buds are expanding in the spring.
For Red Spiders whenever they are prevalent.
2]/2. Sulfid of Potash Stock Solution:
Granulated, or powdered concentrated lye 15 pounds
Sulphur :. 18 pounds
Water to make :..... 20 gallons
Stir the sulphur and lye together in a vessel which will allow
plenty of room for boiling. When well mixed, add about one
pint of water, placing it in a slight hollow in the mixture, and stir
in slowly. The mixture will soon begin to melt and boil, forming
a red fluid; stir until the boiling ceases, and then add water to
make 20 gallons. This stock solution will keep for awhile, or
indefinitely when protected from the air.
Preparation of the Spray Mixture with Sulfid of Potash — Place
10 to 15 pounds of sublimed sulphur, or 14 to 20 pounds of ground
sulphur in the spray tank with 4 gallons of flour paste and 1 to
2 gallons of the sulfid of potash stock solution; add water to make
100 gallons. For summer or spring spraying after the danger of
rains is over, the minimum amount of sulphur is sufficient. Used
for Red Spider.
—82—
3. Distillate 28° to 30° Baume :
Distillate 10 to 20 gallons
Water 200 gallons
For use only with power sprayer with good agitator, which is
necessary to make a mechanical mixture of the oil and water.
For the Brown Apricot, Black and other unarmored Scales, and
for Woolly Aphis, to be applied during the dormant season, pref-
erably in early winter.
4. Distillate Emulsion : Stock emulsion —
Hot water 12 gallons
Fish oil soap (see No. 12) or whale-oil soap...30 ^AllUllfe lbs«
Distillate 30° to 40° 20 gallons
Add soap to hot water in spray tank with agitator going. After
soap is dissolved add oil slowly, keeping mixture agitated. Pump
out through nozzle at 175 pounds pressure into storage tank.
For use take —
Stock emulsion 11 gallons
Blackleaf 40 1 pint
Water 200 gallons
Place oil emulsion in spray tank, start agitator and add the
water. When diluted add the Blackleaf. For Thrips, Black Peach
Aphis and other plant lice.
5. Kerosene Emulsion :
Dissolve ^2 lb. soap in 1 gallon hot water ; add 1 gallon
of kerosene.
Mix thoroughly with spray pump by turning nozzle back into
mixture. For plant lice and other sucking insects during growing
season, dilute with 15 to 25 gallons of water. For scale insects,
Woolly Aphis and other sucking insects during dormant; season,
dilute with 5 to 10 gallons water. For use on small scale with
sprayer.
6. Kerosene Emulsion. Kitchen formula:
Dissolve 1 inch cube soap in 1 pint hot water; add 1
pint kerosene. Churn with egg beater.
For growing plants, dilute to 2 or 3 gallons water. For dormant
plants, 1 gallon.
—83—
7. Miscible Oils:
Commercial preparations of oil so treated as to mix directly
with water. Follow directions on container. Uses same as 3, 4, 5,
8, 9 and 12.
8. Straight Kerosene or Water White Oil:
Water white oil (42° Baume) or kerosene 20 gallons
Water 1 200 gallons
In use for scale insects on citrus trees. Application by power
outfit.
9. Soap Solution :
Soap 1 pound
Water 5 to 15 pounds
Whale-oil or fish-oil soap preferable, but for small amounts any
yellow laundry soap will answer. For plant lice and other suck-
ing insects during summer.
10. Carbolic Acid Emulsion :
Whale-oil soap 40 pounds
Crude carbolic acid - •. 5 gallons
Water to make 40 gallons
Dissolve soap well in hot water, add carbolic acid and boil slowly
20 minutes (reserve some water for adding to prevent boiling over).
For use add 1 gallon to 20 gallons of water. For Mealy Bugs or
Scale.
11. Soap Solution. Kitchen formula:
1J4 mcn cube soap, 1 gallon warm water.
12. Fish Oil Soap :
Water 6 gallons
Lye (98%) 2 pounds
Fish oil ; _ 1^ gallons
Add lye to water in boiler. When dissolved and water boiling,
pour in the fish oil, stirring in meantime, and boil slowly for two
hours. This will give about 40 pounds soap. For use dilute with
5 to 15 gallons water for each pound. For same pests as No. 9.
13. Tobacco or Nicotine :
a. Blackleaf 40 (40% nicotine) 1 pint
Water 200 gallons
b. Tobacco stems r 1 pound
Water 4 gallons
Steep stems in 1 gallon warm water and dilute to 4 gallons.
For plant lice and other sucking insects during growing season.
For Woolly Aphis and Peach Aphis underground. A liberal solu-
tion, or the dry dust in early winter, about the base of the tree,
the surface soil being first removed.
14. Tobacco Soap :
Blackleaf 40 (1-10 gal.) 1 pound
( Cresol soap , 1 gallon
Or
( Whale-oil soap 10 pounds
Water 200 gallons
The cresol soap requires no heating. Use same as 13. Penetrat-
ing and wetting power better.
15. Lime Sulphur Tobacco:
Commercial lime sulphur 36° 20 gallons
Blackleaf 40 .' 14 fluid oz.
Water .. 200 gallons
For Orange Thrips.
16. Carbolic Lime:
Quicklime - 150 pounds
Crude carbolic acid 2 gallons
Water 200 gallons
For Pear Thrips.
17. Sulphur:
a. Dry. Thoroughly dust over the foliage, preferably
when moist with dew. Hydrated lime, about equal
parts with sulphur will increase adhesiveness.
b. Spray. Sulphur 30 pounds, lime (as milk of lime)
15 pounds, water 200 gallons.
c. Spray. Commercial lime sulphur 4 to 5 gallons,
water 200 gallons.
For Red Spiders and Silver Mite.
—85—
18. Lead Arsenate :
Lead arsenate 6 to 12 pounds
"Water 200 gallons
First mix arsenate with 2 or 3 gallons of water. For Coddling
Moth and most defoliating insects.
19. Lead Aresnate. Kitchen formula:
Lead arsenate 1 tablespoonful (1 oz.)
Water ~ 1 gallon
20. Paris Green:
Paris green _ iy2 to 2 pounds
Water 200 gallons
For Coddling Moth and most defoliating insects. Not to be
used along coast or moist situations where injury is likely to result
to foliage.
21. Paris Green. Kitchen formula :.
Paris green (*4 oz.) 1 teaspoonful
Lime 3 teaspoonfuls
Water : 2 gallons
22. Poisoned Bait:
B ran _ 10 pounds
( Paris green * . 1 pound
Or
( White arsenic J^ pound
Water 2 gallons
Molasses J^ gallon
Mix paris green with bran dry. Add molasses to the water and
mix into the bran, making a moist paste. For Cut Worms and
Grasshoppers, distribute a small handful about the base of the
vines or tree, or scatter about plants in the garden. May be dis-
tributed broadcast for Grasshoppers and Army Worms.
23. Poisoned Bait. Kitchen formula :
B ran 1 quart
Paris green 1 teaspoonful
Molasses 1 teaspoonful
—86—
24. Tree Barriers:
a. Tree Tanglefoot.
Mix with a gentle heat one pound of resin and one gallon of
castor oil, and when cold thin as desired with more castor oil.
One of the best ways to apply it is to saturate a piece of baling
rope with the well thinned mixture and tie around the trunk of
the tree. This will remain sufficiently sticky about ten days, as
long as anything of the kind we know of. A strip a few inches
wide surrounding the tree trunk, placed in the fall and tended
during the winter to prevent the ascent of the Canker Worm Moth.
Placed in Hop Vines to prevent ascent of the Hop Flea Beetle.
To bar Argentine Ants or most other insects that reach the fol-
liag by crawling only.
b. Cotton Bands:
A four inch strip tied round the tree by a string at the lower
edge, and the top then pulled down over the string is in use
against Fuller's Rose Beetle on the orange, and other beetles and
worms. See State Experimental Station Bulletin No. 214.
c. Mosquito Wire Netting:
This similarly applied is in use against the Canker Worm.
d. Asphaltum :
A strip 6 to 8 inches wide painted about base of tree trunk to
prevent the entrance of the Peach Tree Borer.
25. Ground Barriers :
A deep furrow with straight side next to the field to be pro-
tected will stop the progress of Army Worms. Holes 8 or 10
inches deep and 20 or 30 feet apart may be dug in the furrow.
The worms upon falling in these may be killed by pouring in a
small amount of gasoline and throwing in a lighted match, or oil,
hot water, or other means as seems desirable.
26. Carbon Bisulphide :
For treatment of stored products and underground insects.
Usual dosage, 1 pint to 1000 cubic feet space.
Place liquid in saucers or shallow vessels above material to be
treated. Inflammable; avoid lights.
For underground insects, a tablespoonful in holes 3 or 4 feet apart.
—87—
27. Cyanide of Potassium :
One ounce to one gallon of water poured into a trench sur-
rounding a tree affected with Woolly Aphis or Black Peach Aphis
is an excellent remedy. Use two to five gallons of the mixture
according to the size of the tree to be treated. Too strong a
dose is apt to injure the tree.
28. Hydrocyanic Acid Gas :
Potassium cyanide (98%) 1 ounce
Sulphuric acid (93%) 1 fluid oz.
Water 3 fluid oz.
Or
Sodium cyanide (129%) £4 ounce
Sulphuric acid (93%) 1# fluid oz.
Water ; \l/2 fluid oz.
Place water and acid in earthenware vessel and add cyanide. To
be used under tents or in tight rooms or boxes. This formula
is a standard dose for 100 cubic feet of space within a tent stretched
over a tree or nursery stock to be fumigated for Red or Purple
Scale. Three-fourths of this amount is right for Black Scale in
the fall months. In a tight building or tight box, one-half of
this dose is enough. In all cases leave exposed for one hour.
For scale insects on citrus trees, maximum or Purple and Red
Scale dosage can be found by multiplying distance around by
distance over the top of tented tree and pointing off two places.
Example :
Distance around Distance over
40 feet x 20 feet — 8 ounces cyanide
For Black Scale reduce one-quarter.
29. Resin Dipping Solution :
Resin 20 pounds
Caustic soda or lye 8 pounds
Fish oil : 3 pints
Water 100 gallons
Boil resin and caustic soda in 50 gallons of water for one hour.
Dilute to 100 gallons. In use for dipping citrus nursery stock for
scale insects and Red Spiders. Kerosene emulsion and lime sulphur
also used for dipping deciduous nursery stock.
—88—
30. Kerosene or Crude Oil :
A thin film spread over the surface of a mosquito-breeding pool
or container will destroy the wrigglers. For large scale work,
the cheaper crude oil may be used and evaporation will occur
less rapidly. Four parts of heavy oil 18° to one part light oil 30°
to 35° gravity will spray readily from nozzles. Drainage or other
permanent work should have precedence over temporary treatments.
31. Pyrethrum or Buhach:
Fresh material dusted around floors and walls will reduce the
number of fleas and other household insects.
32. | Formalin: A 5% solution of formaldehyde sweetened with
sugar and placed in shallow vessels makes a satisfactory fly poison.
Proper disposal of manure and garbage, however, is the basis
for house-fly control.
33. Ant Poison:
Syrup containing between ^4 and % of one per cent arsenic. A
sponge saturated with the arsenic solution and placed in a small
fruit jar with perforated cover should be placed where ants fre-
quent. Carbon bisulphide or cyanide solution may be applied to
the nests in the ground.
Fungicides
1. Bordeaux Mixture:
Nearly fill two 50 gallon barrels with water; put 50 pounds
of bluestone in a sack and suspend near the top in one barrel.
This plan hastens it in dissolving. Then slack 50 pounds of good
stone lime by adding a little water at a time, stirring it to a thick
smooth paste, then add water to make a liquid, then pour it into
the other barrel. Now each gallon from these barrels will con-
tain one pound of the solid ingredients. Nearly fill two other
barrels or the spray tank with cold water and strain in the stock
solutions both kinds running slowly at the same time while the
water is well stirred. The proportions are bluestone 5 pounds,
lime 6 pounds and water 50 gallons. These proportions may vary
from 3 to 8 pounds of bluestone, always using a little more than
an equal weight of lime. The leafless tree will bear much stronger
spray than the leaves, and it can be used much stronger in rainy
weather than in fair weather. Keep it well stirred when spraying.
—89—
Bordeaux Mixture is the standard fungicide and is used for Mil-
dew, Peach Leaf Curl, Celery Blight, and all fungus diseases.
2. Formaline or Corrosive Sublimate :
1 pint formalin (40% strength) in 30 gallons of water.
Or
2 ounces Corrosive Sublimate in 15 gallons of water.
Will tend to prevent scab in potatoes if the seed is dipped in
it before planting.
3. Iron Sulphide Spray:
This spray is highly recommended for Apple Mildew. It can be
bought ready prepared.
4. Lime Sulphur Spray:
This spray made as per Insecticide Spray No. 1 is also a good
fungicide.
—90—
PRUNING
Tnis is a very puzzling subject to beginners in horticulture,
or to newcomers from Eastern States, and experience only will
give a thorough knowledge of it; but a few general statements on
it might be of material assistance, while leaving them free to adapt
their methods to their own localities, climate, or the special needs
of their trees.
—91—
This illustration gives a general idea of the growth and pruning
of young apple, plum, pear and apricot trees.
Peach trees should be pruned in about the same way, but as
they grow faster, a larger top will be obtained in the same time.
Citrus trees need little pruning for the first six years, but let them
branch about two feet from the ground and shape the top a little,
cutting back any branches which become too prominent.
As the deciduous trees grow older, less pruning will be required,
but they must be kept cut down to any height or shape desired.
The tree should be kept low enough for convenient care and fruit
picking but not so low that, to obtain the desired size of the top
they will become too wide, and thus interfere with cultivation.
The shape of the tree can often be corrected by weighting down
the branches on the side of light growth, thus making them more
spreading. The checking of the upward growth also stimulates
fruit production.
Unthrifty trees of all kinds should be severely pruned, as the
more new wood can be grown into the top the better, but they
should be well fertilized at the same time.
Winter is the best time to prune deciduous trees and wood
growth is stimulated thereby more than by work done in the sum-
mer, but fall pruning of citrus trees produces wood, while spring
pruning stimulates fruit production.
A tree bearing only on alternate years can often be induced to
bear better crops on the "off" years by severe pruning and the
thinning of the fruit, on fruitful years. Good habits in trees as in
people can be much promoted by proper training when young.
In this climate, the tops of the deciduous trees should not be
much thinned out but should be kept compact, as much of the
fruit is produced in the center of the tree. The branches also
are kept stocky and strong to bear up the fruit, and vigorous
new growth produced by outside pruning shades the fruit and
prevents sunburn, especially of apricots.
Citrus trees, however, produce the best results when well thinned
out after the age of six or seven years, so that the foliage and
fruit will be nearly all on the outside of the tree; and on any
kind of a tree, a dead or useless branch should be removed. This
especially applies to sucker growths. These are vigorous, upright
shoots, springing up through the center of the trees like a new
tree starting up from a branch. They are useless and in their
growth use nourishment which should go to the support of the
tree. Cut them off close to the parent branch as soon as noticed.
—92—
NOXIOUS WEEDS
Johnson Grass
(Sorghum halepense)
This very formidable plant pest in many localities seems espe-
cially adapted to some of the loose soils of our County, and to
people living there no description is necessary. But it is scattered
in patches all over the County, especially in the washes south of
Johnson Grass (Sorghum halepense)
A — Growth first year. B — Older plant, deaper root.
the mountains, and many persons would like to know it when
they see it, and know how to get rid of it.
The blades of this grass are often half an inch wide and of cor-
responding length, and the strong stalk grows to a height of three
feet or more, topped by a bushy head looking somewhat like sorg-
—93—
hum or broom corn in miniature, having the same reddish tinge,
but more drooping like oats, and the seed is nearly round. In
a favorable spot the grass will grow as thick as possible, but there
are seldom stalks enough to hide the leaves near the ground, where
they are very thick.
To eradicate this grass, first plow it well, or if fences, trees, etc.,
prevent that, dig it up by hand, and in either case, rake out all
the roots possible with potato hooks ; but you will never get them
Johnson Grass-root System.
all and as soon as the remaining ones send up shoots again, go
over it again with the tool most conveniently used, and cut off
every shoot below the surface, and this should be done as often
as they spring up until they cease to show themselves, when the
roots have become exhausted and died. Ordinarily the grass can
be killed out in a season if kept at persistently and cut off under
ground often enough, but in just the right kind of moist sandy
loam it may take longer.
The roots are very large and vigorous, and often go very deep,
—94—
but if growth to the air can be prevented, they will die in time.
It is a misdemeanor in this State to allow the growth of this
grass, and no matter how small the patch, it should be vigorously
attacked and killed, as the future will well reward you for doing
so, and your neighbors will "bless you" for removing the dangerous
pest from the vicinity.
Canada Thistle.
Canada Thistle
This is a comparatively small member of the thistle family but
so persistent when established that the first sign of its arrival
should call for very active efforts to kill it out completely.
The leaf has a scalloped and ruffled appearance, and on each
curl of the ruffle is a thorn, with many other thorns about the
stalks. These stalks are never more than two feet high, often
—95—
much shorter, slender and topped with a bloom much like that
of the Bull Thistle, but never more than an inch across. The
bulb where it joins the stalk is smaller in proportion also, and
the bloom more widely spread and flat. The color of the bloom
is purple.
In small patches cut the plants off below the surface, the deeper
the better, and apply salt freely. Watch carefully and as soon as
any plants appear cut them off again and salt again, and if this
is done often and persistently enough, they can be killed in a
summer. The salt may spoil the soil for a time, but this loss will
not compare with the gain of freedom from this pest. Any plant
will die if kept for a long time from growing above the surface,
but the salt hastens the killing.
The Russian Thistle
This is a member of the "tumble weed" family, and grows in
the globular form of these plants. The thorn grows where the
small pointed leaf joins the stalk, and little flowers come on the
sides of the stalks. When the plant is ripe the attachment to the
root weakens until it breaks, and the weed rolling before the wind
often scatters its seed over a very wide territory.
It is an annual plant, growing entirely from the seed, and not
much harder to kill out than a host of other annual weeds which
we yearly combat. Of course, it is one more variety, and when
just getting started in a neighborhood should be exterminated if
possible, and that is not a very difficult undertaking.
Wild Morning Glory
A great pest in some localities, and entirely immune to ordinary
crop cultivation. By continuous cultivation with sweep cultivators,
and hoes where necessary, its seeding may absolutely be prevented
and this treatment continued in all seasons will prevent the weed
from making much growth above the surface. If it can get no
growth in the air any ordinary plant will die in time, and the
morning glory is no exception. Patience and persistence are the
remedies. Every green sprout must be cut off below the surface
once a week in the growing season. The plant will then starve,
but it may take two years.
Russian Thistle (Salsolipali)
a — Branchlet showing leaves, b — Seed-pod magnified, c — Branchlet showing
spiny bracts and blossoms natural size.
—96-
—97—
-
Seeds of clover dodder and white clover, showing
relative sizes. Enlarged.
Love Vine or Dodder
This is the bright yellow or orange colored vine seen in various
uncultivated places running over the weeds or brush, or much
worse, in alfalfa fields. It is of the morning glory family, but when
well started fastens itself to the stalk of its host plant, its root
dies, and it becomes a parasite, drawing nourishment from the
plant supporting it. Fire is the only remedy. Cut and pile the
vine and host plantj put on more rubbish if obtainable, to cover
the whole patch, and burn, and do this before the dodder seeds.
Look out for it in alfalfa seed. You can detect it with a pocket
glass.
Detection of the presence in commercial seed of dodder, irrespec-
tive of its kind, demands first consideration, because its presence
justifies refusal to purchase such seed. A magnifying glass is nec-
essary, as it will enable one to readily distinguish any kind of
dodder seed from clover, alfalfa, or flax seed. Dodder seeds are,
as a rule, about the same size as red clover seeds, including the
smallest and largest seeds. The surface is finely roughened and
dull, and the general form varies from nearly spherical to strongly
flattened and oval or nearly circular. The color is gray, yellowish
brown, or reddish brown, depending largely on the kind. In con-
trast, clover and alfalfa seeds are smooth, often with a slight
luster. Their triangular, oval, or kidney form aids in distinguish-
ing them from seeds of the dodder.
Cockle Burr
Never let it seed. It will perhaps need watching for several
years as the burrs, if buried several inches deep by the plow, lay
dormant in the ground, but grow when in subsequent years they
are thrown up nearer the surface. The oily nature of the seed
preserves it in the ground for years.
—98—
THE HORTICULTURAL COMMISSIONER'S AUTHORITY
FROM THE STATE
Section 2322a of the Political Code of the State of California is
as follows :
It shall be the duty of the county horticultural commissioner in
each county, whenever he shall deem it necessary, to cause an in-
spection to be made of any premises, orchards or nursery, or trees,
plants, vegetables, vines, or fruits, or any fruit-packing house, store-
room, salesroom, or any other place or article in his jurisdiction,
and if found infected with infectious diseases, scale insects, or
coddling moth, or other pests injurious to fruit, plants, vegetables,
trees, or vines, or with their eggs, .or larvae, or if there is found
growing thereon the Russian thistle or saltwort, Johnson grass
or other noxious weeds, he shall, in writing, notify the owner or
owners, or person or persons in charge, or in possession of the said
places or orchards or nurseries, or trees, or plants, vegetables, vines,
or fruit, or article as aforesaid, that the same are infected with said
diseases, insects or other pests, or any of them, or their eggs or
larvae, or that the Russian thistle or saltwort, Johnson grass or
other noxious weeds is growing thereon, and require such person
or persons, to eradicate or destroy the said insects, or other pests,
or their eggs or larvae, or Russian thistle or saltwort, Johnson grass
or other noxious weeds within a certain time to be therein specified.
Said notices may be served upon the person or persons, or either
of them, owning or having charge, or having possession of such
infested place or orchard, or nursery, or trees, plants, vegetables,
vines, or fruit or articles as aforesaid, or premises where the Russian
thistle or saltwort, Johnson grass or other noxious weeds shall be
growing, or upon the agents of either by any commissioner, or
by any person deputed by the said commissioner for that purpose
in the same manner as a summons in a civil action ; provided, how-
ever, that if any such infected or infested articles, property or
premises as hereinabove specified belong to any non-resident per-
son and there is no person in control or possession thereof and
such non-resident person has no tenant, bailee, depositary or agent
upon whom service can be had ; or if the owner or owners of any
such articles, property or premises can not after due diligence be
—99—
found, then such notice may be served by posting the same in some
conspicuous place upon such articles, property or premises, and
by mailing a copy thereof to the owner thereof -at his last known
place of residence, if the same is known or can be ascertained.
Any and all such places, or orchards, or nurseries, or trees, plants,
shrubs, vegetables, vines, fruit, or articles thus infested, or premises
where the Russian thistle or saltwort or Johnson grass or other
noxious weeds shall be growing, are hereby adjudged and declared
to be a public nuisance ; and whenever any such nuisance shall
exist at any place within his county, and the proper notice thereof
shall have been served, as herein provided, and such nuisance shall
not have been abated within the time specified in such notice, it
shall be the duty of the county horticultural commissioner to cause
said nuisance to be at once abated, by eradicating or destroying
said diseases, insects, or other pests, or their eggs, or larvae, or
Russian thistle or saltwort or Johnson grass or other noxious
weeds. The expense thereof shall be a county charge and the board
of supervisors shall allow and pay the same out of the general fund
of the county. Any and all sum or sums so paid shall be and be-
come a lien on the property and premises from wrhich said nuisance
has been removed or abated in pursuance of this chapter. A notice
of such lien shall be filed and recorded in the office of the county
recorder of the county in which the said property and premises are
situated, within thirty days after the right to the said lien has
accrued. An action to foreclose such lien shall be commenced
within ninety days after the filing and recording of said notice of
lien, which action shall be brought in the proper court by the dis-
trict attorney of the county in the name and for the benefit of
the county making such payment or payments, and when the prop-
erty is sold, enough of the proceeds shall be paid into the county
treasury of such county to s'atisfy the lien and costs; and the over-
plus, if any there be, shall be paid to the owner of the property, if
known, and if not, into the court for his use when ascertained.
The county horticultural commissioner is hereby vested with the
power to cause any and all such nuisances to be at once abated in
a summary manner.
—100—
COUNTY REGULATIONS
For Admission, Inspection and Treatment of Trees and Nursery
Stock
All trees and plants transported into the County must bear a
tag showing where grown and by whom, and must be inspected
by the Horticultural Commissioner or his Inspector, and bear
his certificate of freedom from harmful insects or diseases before
delivery to the consignee. (Los Angeles County Ordinance No.
42 N. S.)
This ordinance has been amended as follows :
Ordinance No. 312 (New Series)
An Ordinance to amend Ordinance No. 42, New Series, entitled
"An Ordinance to promote the horticultural interests' of Los An-
geles County, California, and providing for the inspection and de-
struction of insect pests, and providing for restrictions upon the
importation of cuttings, etc.," by inserting therein between Sections
1 and 2 thereof a section to be known as Section \l/2.
The Board of Supervisors of the County of Los Angeles do
ordain as follows :
Section 1. That Ordinance No. 42 (New Series) entitled, "An
Ordinance to promote the horticultural interests of Los Angeles
County, California, and providing for the inspection and destruc-
tion of insect pests, and providing for restrictions upon the im-
portation of cuttings, etc.," be and the same is hereby amended
by inserting therein between Sections 1 and 2 thereof a new section
to be known as Section 1^ and to read as follows, to wit:
"That no person or person, firm or corporation, either as owner,
agent, factor, broker, servant or other employee shall bring for
delivery, or cause to be brought for delivery, from one section of
the County of Los Angeles to another section of the County of
Los Angeles any trees, plants, vines, shrubs, scions, cuttings, buds
or grafts, without giving written notice of their arrival at their
destination within twenty-four hours thereafter, and prior to re-
moval from said point of destination, to the horticultural commis-
sioner of said county, or to the local inspector of the district into
which the same are so brought, nor shall either the persons, parties
—101—
ur corporations above named remove the same from the place of
their destination until inspected as hereinafter provided.
"That any person or persons, corporation or corporations men-
tioned in Section 1 of this ordinance who shall ship or bring,
or cause to be brought or shipped from one section of Los Angeles
County to another section of Los Angeles County, any trees, scions,
cuttings, buds, grafts, shrubs or plants, shall have placed upon or
securely attached to each package, box or separate parcel of such
articles a distinct mark or label showing the name of the owner,
agent or shipper, the name of the grower and the place where grown.
"All of the provisions of this ordinance applying to shipments
from without the County of Los Angeles into the County of Los
Angeles shall apply equally to shipments from one section of the
County of Los Angeles to another section of the County of Los
Angeles."
Section 2. The Board of Supervisors finds that this ordinance is
needed for the immediate preservation of property in the County
of Los Angeles for the reason that plants, cuttings, shrubs, vines
and other articles of like nature are being shipped from one sec-
tion of the county to another section of the county, thus- spreading
disease and parasites among the horticultural sections of Los' An-
geles County, and for that reason it is hereby ordered that this
ordinance shall be published for at least one week in The Los An-
geles Daily Journal, a newspaper printed and published in the
County of Los Angelss, together with the names of the members
of the Board of Supervisors voting for and against the same, and
that fifteen days after the passage of this ordinance the same shall
take effect, to wit, on the 8th day of October, 1912.
R. W. PRIDHAM,
Chairman Board of Supervisors of County of Los Angeles, State of California
Attest : H. J. LELANDE,
[County Clerk and ex officio Clerk of the Board of Supervisors
All trees and plants to be transported must be inspected before
moved by the Horticultural Commissioner or his Inspector, and
bear his certificate of freedom from harmful insects or diseases.
(Los Angeles County Ordinance No. 220 N. S.)
All fumigators and sprayers doing public work outside incor-
porated cities must obtain licenses from the County, granted on
approval of the Horticultural Commissioner. (Los Angeles County
Ordinance No. 245, N. S., Sec. 53 and 54.)
—102—
STATE QUARANTINE ORDERS
No nursery stock or plants liable to infestation by citrus white
fly will be admitted from the States bordering on the Gulf of
Mexico, or from North Carolina or South Carolina.
No stone fruit trees will be admitted from States east of Missis-
sippi River.
No fruit or plants will be admitted from Hawaii except banana
and pineapple fruit.
No fruit or plants will be admitted from Mexico except sour limes
and banana fruit.
No alfalfa or other hay will be admitted from Utah, Idaho or
Wyoming.
—103—
INDEX
Acacia, Black 17
Alfalfa 16
Alfalfa Weevil 59 and 60
Almond 10
Aphis.. Black Peach 44 and 45
Aphis, Cabbage 64
Aphis, Orange 44 and 46
Aphis, Wooly 44 and 46
Apple 9
Apricot .= 9
Araucaria bidwelli (Monkey puz-
zle) 18
Araucaria excelsa 18
Asparagus 16
Australian Sweet Pea.. 20
Avocada (Alligator Pear) 10
Banana 10
Berries 10
Black Scale , 24-26
Bottle Tree (Sterculia) 17
Bordeaux Mixture 88
Cabbage Bug, Harlequin 66
Cabbage Worm 65
Camphor 17
Canada Thistle 94
Canker Worm 61
Carbon Bisulphide 86
Castor Bean 19
Celery 15
Chestnuts 11
Chinch Bug, False 66
Chlorosis 72
Cockle Burr 97
Codling Moth 51 and 52
Corn WTorm 53
Cottony Cusheon Scale 41
Cut Worm 67
Cyanide (Potassium and Sodium).. 87
Cypress 18
Damping off of Citrus Seedlings.... 72
Diabrotica Soror (Spotted Green
Beetle) 50
Die-Back, Florida 73 and 74
Dodder (Love Vine) 97
Eel Worm 55 and 56
Eucalyptus 21-23
Euonymous (Variagated plant) 19
Ferns 20
Fig ; 1 1
Flat-headed Borer 63
Frost Protection 72
Fullers Rose Beetle 53 and 54
Fumigation . 75-80
Fungicides 88 and 89
Fungus diseases 70-74
Glover's Scale 31 and 34
Grape H
Grape Fruit (Pomelo) 12
Grape Phylloxera 61
Gravillea (Silk Oak) 20
Greedy Scale 30
Guava 1 1
Gum Disease, Citrus 70 and 71
Harmful Insects and Control 24
Hemispherical Scale 28
Horticultural Laws — County
100 and 101
Horticultural Laws— State. ...98 and 99
Insecticides and Sprays 80-89
Ivy, English 20
Ivy Scale 30
Jacaranda 20
Johnson Grass 92 and 93
June Bug 62
Lady Bird — Native California 68
Lady Bird (Novis cardinalis) Aus-
tralian .. ... 41
—104—
Laurestina 19
Lemon 12
Licenses for Fumigators and Spray-
ers 101
Longulus Scale 46
Loquat 13
Love Vine (Dodder) 97
Magnolia 18
Mealy Bug — Citrus 35 and 36
Mealy Bug — Cypress 35 and 36
Mealy Bug — Long-tailed 35 and 36
Mediterranean Fruit Fly 42-44
Mexican Orange Maggot 42-44
Monkey Puzzle 18
Morning Glory (Wild) 95
Mulberry 13
Nectarine 13
Nightshade '. 19
Norfolk Island Pine Scale - 64
Norfolk Island Pine 18
Oleander 19
Olive 13
Orange 13
Orange Aphis 44 and 46
Palm - 18
Papyrus 20
Peach 14
Peach Root Borer 52
Peach Twig Borer 48 and 49
Pear 14
Pepper Tree 17
Persimmon 15
Pittosporum 20
Plum 14
Pomegranate 15
Pomelo 14
Potato, Climbing 19
Potato Worm 57 and 58
Privet or Legustrum 20
Prune 14
Purple Scale 31-34
Pruning 90 and 91
Quarantine Regulations 102
Quince ..15
Red Scale 29 and 30
Red Spider — Almond or Decidu-
ous, Citrus, and Six Spotted...:37-40
Remedies for insects 75-88
Rice Paper Tree 18
Roses 19
Rose and Berry Scale 50 and 51
Scaly Bark, Citrus 71
Silver Mite 37-40
Slug — Pear and Cherry 65
Soft Brown Scale 27
Sprays and Insecticides 80-89
Squash Bug 66
Sterculia 17
Tanglefoot 86
Tent Caterpillar 65
Thistle, Canada 94
Thistle, Russian 95 and 96
Trips, Bean, Citrus and Pear 46-48
Tussock Moth, California 65
Umbrella Tree 18
Umbrella Plant 20
Walnut 15
Weevil Bean and Pea..... 63
White Fly— Citrus 42-44
Wire Worm 62
Wistaria 19
Wither-tip 73
Wooly Aphis 44-46
Yellow Scale ... .-29 and 30
—105—
MEMORANDA
—106—
MEMORANDA
—107—
MEMORANDA
—108—
MEMORANDA
-109-
MEMORANDA
-110-
MEMORANDA
WATCH OUT
x FOR THE :-:
ALFALFA WEEVIL
Report any Strange Insect to the
County Horticultural
Commissioner
DAY AND ^EST°50 C*NTS
OVERDUE. $1'°° ON THE
KELLOW a BROY
PRINTERS
LOS ANdElES. CM
UNIVERSITY OF CALIFORNIA LIBRARY