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CONNECTICUT

AGRICULTURAL EXPERIMENT STATION

NEW HAVEN, CONN

BULLETIN 146, OCTOBER, 1904.

ENTOMOLOGICAL SERIES, No. II.

San Jose Scale-Insect Experiments in 1904.

CONTENTS.

Page

Officers and Staff of Station 2

San Jose Scale-Insect Experiments in 1904 3

Effect of the Winter on the Trees 4

Effect of the Winter on the Insects 4

Materials Used in Spraying 5

Early Winter Spraying 6

Spraying in Late Winter and Spring 11

Connecticut Orchards Sprayed in 1904. 19

Making the Boiled Mixture 21

Making the Mixture without Boiling 24

Outfit for Applying the Mixture 27

Summary 32

The Bulletins of this Station are mailed free to citizens of Connec-
ticut who apply for them, and to others as far as the limited editions
permit.

CONNECTICUT AGRICULTURAL EIPERIIENT STATION.

OFFICEES AXSTID STAFF.

BOARD OF CONTROL.

Ex officio.

His Excellency Abikam Chamberlain, President.

Prof. W. O. Atwater Middletown.

Prof. W. H. Brewer,, Secretary New Haven.

B. W. Collins Meriden.

T. S. Gold West Cornwall.

Edwin Hoyt New Canaan.

J. H. Webb Hamden.

E. H. Jenkins, Director and Treasurer New Haven.

STATION STAFF.

Chemists.

Analytical Laboratory.

A. L. Winton, Ph.D., Chemist in charge.

E. Monroe Bailey, Ph.B. Kate G. Barber, B.S.

I. A. Andrew, Ph.B.

Laboratory for the Study of Proteids.

T. B. Osborne, Ph.D., Chemist in charge.

I. F. Harris, M.S.

Botanist.
G. P. Clinton, S.D.

Entomologist.
W. E. Britton, Ph.D.

Assistant to the Entomologist.
B. H. Walden, B.Agr.

Forester.
Walter . Mulford, F.E.f

In charge of Forestry Work.
Austin F. Hawes, M.F.

Grass Gardener.
James B. Olcott, South Manchester.

Stenographers and Clerks.

Miss V. E. Cole.
Miss L. M. Brautlecht.

In charge of Buildings and Grounds.
William Veitch.

Laboratory Helper.
Hugo Lange.

Sampling Agent.
V. L. Churchill, New Haven.

f Absent on leave.

San Jose Scale-Insect Experiments in 1904

W. E. Britton and B. H. Walden.

Bulletin 144 of this station contains an account of the experi-
mental spraying work against the San Jose scale-insect for 1903.
In December of that year tests were made in Bridgeport to
determine whether fall or early winter spraying with lime and
sulphur could be depended upon to hold the scale in check in
Connecticut. About 770 trees, mostly Japan plum, with a few
peach and pear trees, were treated. A few trees in New Haven
were also sprayed in the fall.

In the spring of 1904, spraying experiments were conducted
at New Haven, Westville, Wallingford, Milford and South-
ington. The boiled mixture did not seem to adhere to the
trees as well as last year, doubtless owing to the different
climatic conditions. Wherever the lime and sulphur mixtures
are used there is a decided tendency for the young scales to set
upon the fruit and leaves instead of the twigs that have been
covered with the spray mixture. This is doubtless the case
where any adhesive mixture is used, and often the fruit is dis-
figured by the scales when they are not abundant on the twigs.

All of the lime and sulphur mixtures seem to have consider-
able value as fungicides.

Young scales were first observed crawling on June 25, at
New Haven.

The whole number of trees and plants treated in these experi-
ments was approximately as follows :

-v, °rj ',. f- December treatment.

New Haven 14 \

Westville 150^

Wallingford 130 |

Milford 481 J- Spring treatment.

Southington 2552 j

New Haven 35 J

Total 4134

The effects of the winter on the trees make it impracticable in
many cases to express the results of the spring treatment in
exact figures, as was done in bulletin 144. In some cases,
however, this can be done, and we consider the general results
to be of sufficient value for publication, and so present them in
the following pages :

4 connecticut experiment station, bulletin i46.

Effect of the Winter on the Trees.

It would be manifestly unfair to give any account of experi-
mental spraying work against the San Jose scale-insect without
mentioning the very unusual effect of the season in causing
injury to trees and orchards. The extraordinary winter killed
many peach and plum trees in Connecticut, and thousands were
seriously injured. Scale-infested trees, as a rule, were the first
to show this injury and thousands of such trees in peach
orchards went into the winter in a weakened condition never
to leaf out again. But the damage was by no means confined
to infested trees. In some places young and vigorous peach
trees were frozen and killed to the snow line and had to be
cut away, while in many orchards, especially on the lower levels,
the fruit buds were entirely destroyed. In some instances trees
leafed out, but soon withered and died. Large apple trees in
different parts of the State appeared sickly in June and July
and some of the branches withered and died. An examination
failed to show the presence of any parasitic trouble, and their
condition could be ascribed only to winter injury. On the
whole, Connecticut orchards suffered a vast amount of damage,
from which some of them will not recover in several years, if
ever.

At the time of cutting twigs to examine the insects prior to
spraying, the best looking infested twigs were selected, but the
extent of this winter injury could not then be determined. But
in many cases the infested wood was injured or dead and most
or all of the scale-insects were dead in consequence, before the
spray was applied.

In June, when the twigs were cut for the second examination
to show the effect of the treatment, the trees were in leaf and
it was easy to distinguish the living from the dead branches.
Only living branches, of course, were examined at this time,
and in some cases the number of living insects after the treat-
ment exceeded the number found on the injured branches at
the first examination.

Effect of the Winter on the Insects.

Ordinarily we find that a portion of San Jose scale-insects

are killed each winter — probably by the climatic conditions.

Twenty-five per cent, is about the average mortality pjid 75

per cent, of living insects is about the number that :pect

MATERIALS USED IN SPRAYING. 5

to find when we cut twigs for examination in March or April.
The past winter proved to be an exception to this rule, the mor-
tality being much greater than usual. Seldom did we find
50 per cent, of the scale-insects alive, even on healthy twigs.
So many of the twigs were injured that much less than 50
per cent, of the whole number of scale-insects actually sur-
vived the winter.

Materials Used in Spraying.
Various materials prepared after 15 different formulas were
used in these experiments. The formulas are given below,
each with a separate number, by which it is designated in the
following pages. The details of preparing each are given on
pages 21-28.

BOILED MIXTURES.

1. — 14 lbs. lime. ) Flowers of sulphur made into a paste and

14 lbs. sulphur. ;- slaked with lime. Mixture boiled 30 minutes
40 galls, water. ) with steam.

2. — 14 lbs. lime. ) Light sulphur flour not made into a paste but

14 lbs. sulphur. 1 added dry to the slaking lime. Boiled 45 to 60

40 galls, water. ' minutes.

-20 lbs. lime. ) Light sulphur flour not made into a paste but

14 lbs. sulphur. - added dry to the slaking lime. Boiled 45 to 60

40 galls, water. ) minutes.

3--

-20
20
40 galls, water.

MIXTURES NOT BOILED.
,, ,. "I Lime slaked and potassium sulphide

s. 1m . dissolved separately and then put to-

lbs. potassium sulphide. >■ ., .., r., J \.. c

o-aiic Wa*pr i gether with the proper quantity of

J water.
) Fused sodium sulphide broken into

- small lumps and added to the slaking
} lime.
) Fused sodium sulphide broken into

- small lumps and added to the slaking
\ lime.

5. — 20 lbs. lime.

20 lbs. sodium sulphide.

40 galls, water.
6. — 20 lbs. lime.

10 lbs. sodium sulphide.
40 galls, water.

7. — 20 lbs. lime.

6 lbs. sulphur.
6 lbs. sodium sulphide.
40 galls, water.
8. — 20 lbs. lime.

11 lbs. sulphur.

11 lbs. sodium sulphide.
40 galls, water.
9. — 14 lbs. lime.

6 lbs. sulphur.

6 lbs. sodium sulphide.
40 galls, water.
10. — 14 lbs. lime.

11 lbs. sulphur.

11 lbs. sodium sulphide.

40 galls, water.

Light sulphur flour, sulphide in lumps,
both added to slaking lime.

! Flowers of sulphur, sulphide in lumps,
both added to slaking lime.

! Flowers of sulphur, sulphide in lumps,
1 both added to slaking lime.

6 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

11. — 20 lbs. lime. "]

14 lbs. sulphur. ! Flowers of sulphur, sulphide in lumps,

6 lbs. sodium sulphide, f both added to slaking lime.
40 galls, water. J

12. — 8 lbs. caustic soda. ) -.. , , , . , , , ...

aq o-qlls water I" Dissolved soda in cold water and applied.

13. — 7 lbs. caustic soda. ) ^.. , , , . , , . ...

40 cralls water f Dissolved soda in cold water and applied.

14. — 14 lbs. lime. ■]

14 lbs. sulphur. I Light sulphur flour and caustic soda added

7 lbs caustic soda. [ t0 the slakin? ]ime.
40 galls, water. J

15. — 20 lbs. lime. ")

14 lbs. sulphur. ! Light sulphur flour and caustic soda added

5 lbs. caustic soda. { to the slaking lime.

40 galls, water. J

Early Winter Spraying.

On account of the unfavorable weather and the rush of work
in late winter and spring, it would frequently be more con-
venient for orchardists to spray in the fall. Ordinarily in
Connecticut the San Jose scale-insect continues breeding until
about December i. Last fall the young were observed crawl-
ing on December 2. We believe that if the spraying can be
done as soon as the leaves drop or during November, that a
large proportion of the young will be killed, and that they are
much more susceptible to the effect of the sprays than after
they are partially grown and better protected by their shells
or armor. The mature insects die naturally, before spring,
and it is only the half or partially grown individuals that carry
the species through the winter.

The experiments in fall spraying herein described were made
December 10 and later, and though satisfactory it seems rea-
sonable that even better results might follow from a treatment
made two weeks earlier in the season.

Experiments at Bridgeport.
At Bridgeport an orchard of about six hundred Japanese
plum, one hundred and twenty-five peach, thirty-four pear and
ten quince trees was sprayed with the lime and sulphur mixture
December 10 and n. The trees were quite close together
and irregular in size. This orchard was sprayed in the spring
of 1902 with crude oil and water. While this treatment was
quite successful, some scales came through alive, and as the
orchard is in a badly infested locality, conditions were favorable
for the scale to continue to breed. Since the treatment in 1902,

EARLY WINTER SPRAYING, BRIDGEPORT. J

trees which became badly infested were sprayed with kerosene
emulsion, whale oil soap, or other similar mixtures. At the
time of the last treatment, the orchard was not badly infested,
but scales could be found on nearly every tree.

The lime and sulphur mixture was prepared at a near-by
woodyard, where a twenty horse-power upright boiler fur-
nished steam to cook the mixture. A fifty gallon cask was
used for boiling the mixture, steam being conveyed through
a hose connected to the boiler.

The following formula (No. i) was used:

14 lbs. fresh finishing lime.
14 lbs. flowers of sulphur.
40 galls, water.

The sulphur was made into a thick smooth paste with water
as hot as could be conveniently borne by the hands, which were
used to work the lumps out of the paste. The lime was/ put
into a barrel, hot water added, and as soon as it commenced
to slake the sulphur paste was poured in, and the whole stirred
to prevent the lime from "burning." By the time the lime was
slaked we had a smooth mixture which was assuming a darker
color, showing that the sulphur was being dissolved. About
one-third the required amount of water was then added, the
steam turned on and the mixture boiled vigorously for thirty
minutes. This was stirred frequently, and the hose moved to
different places in the barrel so that the mixture was kept well
agitated. The boiled mixture was dipped out and strained
into the pump barrel.

The sulphur appeared to be all dissolved, and very little
sediment was present, that which accumulated in the strainer
being practically all washed through with cold water. After
the boiled lime and sulphur mixture was transferred to the
pump barrel, cold water was added until the barrel was filled
within about four inches of the top. This made practically
forty gallons.

The spraying outfit consisted of a barrel pump, mounted on
the end of a forty-five gallon barrel. This was placed on a
low wagon, and fitted with two lines of one-half inch hose
from thirty to forty feet long. To each line of hose was
attached an eight-foot bamboo extension with a double Vermorel
nozzle.

CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

The trees were coated as thoroughly as possible. On some
of the trees that had been sprayed with the soap and oil solu-
tions the mixture did not seem to stick as well, and when the
trees dried the coating was of a bluish grey color.

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Formula No. 1 —
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14 lbs. sulphur.
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Condition of trees
before treatment.

Moderately infested.

2»i

•*J- in O co O N
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Pear

Peach

Jap. Plum .
Wild Plum
Quince

Average .

EARLY WINTER SPRAYING, NEW HAVEN. 9

No twigs were cut for the purpose of examining the scales
at the time of treatment, but it was assumed that ioo per
cent, were alive at that time, as the insects had been breeding
up to a few days previous and there had been no cold weather
to cause wholesale destruction of them. Twigs were cut
January 2, 1904, and examined, and again on June 22. The
figures are given in Table I. on page 8.

Results at Bridgeport.

It has already been stated that the trees were not made very
white by the mixture (Formula No. 1). This is partly due to
the fact that oil had previously been used on some of the trees,
and partly due to the small quantity of lime in the mixture.
Nevertheless, the adhesive qualities were good and the mixture
could be seen on the trees in some places when the final exami-
nation was made on October 20.

On December io-ii, when the spraying was done, the scales
were about all alive. On January 2, less than a month after
the application, twigs were cut and examined, with the result
that an average of 17.5 per cent, of living insects were found.
This can fairly be attributed to the effect of the treatment,
principally because no severe weather or ice storms had occurred
to kill the scale-insects in unusual numbers.

The results of the second examination of twigs on June 22
are somewhat disappointing, as an average of 10.6 per cent, of
living insects were found after one of the most severe winters
known in recent years. In spite of the rather large percentage
of living insects in this test, the writers believe that fall or early
winter spraying can and soon will be practiced by the growers.
We shall make further tests along this line. The following
account of fall spraying at New Haven shows better results in
figures than the Bridgeport experiments.

When the final examination was made of the sprayed trees
at Bridgeport on October 20, they were found to be in a very
satisfactory condition. The trees had made good growth, borne
a crop of fruit and few living scale-insects could be found.

Experiments at New Haven.

On December 19 a number of small trees and shrubs in the

western part of the city were sprayed with the lime and sodium

sulphide mixture (Formula No. 5). The sulphide was broken

into lumps not larger than butternuts and was added to the

IO CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

lime after the slaking process was well started with hot water.
After slaking the lime the whole was allowed to stand for a few
minutes, utilizing the heat to help dissolve the lumps of so'dium
sulphide. Then cold water was added and the liquid sprayed

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SPRING SPRAYING, WESTVILLE. II

upon the trees. This makes a mixture which is ash-grey in
color and does not disfigure the trees and shrubs to which it is
applied like the boiled mixture ; but it is very caustic in its
action, and therefore needs to be handled with more care. Sore
spots are formed wherever it strikes the skin and it corrodes
the finger nails ; therefore face and hands should be well pro-
tected if this mixture is to be used.

A few trees on the station grounds were also sprayed during
December, using the same formula.

Table II. contains the data connected with these tests.

Results at New Haven.
Most of the trees sprayed with lime and sodium sulphide were
on rented land and were destroyed by the tenant on vacating the
premises in April. The twigs examined, therefore, were cut
during April instead of June, as in most of the other experi-
ments. Nevertheless the percentage of living insects was rea-
sonably small, though probably the winter is partly responsible.
Two larger trees (apple) on the station grounds received similar
treatment, and though only 5 per cent, of living insects were
found in June the trees were fairly well coated with scale-
insects in October at the writing of this bulletin.

Spraying in Late Winter and Spring.
Westville Experiments.

About 150 pear trees were sprayed on March 21 and 24.
This is the same orchard that was sprayed last year and
described in bulletin 144, page 9. The condition of the trees
generally was about the same as last year, except that those
treated last season with Bordeaux mixture and plain white-
wash were more scaly than was the case a year ago, and also
more scaly than the other trees. Nearly all were seriously
infested, but had not suffered from winter injury as much as
most peach and plum trees in the same region.

March 21 was a bright, still day, becoming cloudy in the
afternoon, with a light snow at night and a light drizzle of rain
in the forenoon of the 22.

The boiled mixture (see formula No. 2, page 5) was used
on the first five rows, beginning on the northwest side. Hot
water and light sulphur flour were added to the hard finishing

12 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

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SPRING SPRAYING, WALLINGFORD. I 3

lime and the mixture well stirred until the lime was thor-
oughly slaked. It was then boiled for 45 minutes in a feed
cooker corresponding to a kettle over a wood fire. This outfit
is shown on plate II. b. The next eight rows were sprayed with
lime, sulphur and sodium sulphide, four receiving formula No.
9, and four formula No. 10. One row was sprayed with lime,
sulphur and caustic soda (Formula No. 14) and one row with
the caustic soda solution (Formula No. 12).

Results at Westville.

These spraying tests show the boiled lime and sulphur mix-
ture to be no more efficient in destroying the scale-insects than
similar mixtures containing lime and sulphur and prepared
without boiling. Apparently there was not much difference in
the adhesive qualities of these mixtures. When twigs were cut
in June for final examination, the whitish coating could be seen,
especially on the under sides of the branches of all the trees,
except, of course, those receiving the caustic soda solution
containing no lime. Caustic soda solution as used here (1 lb.
in 5 gallons water) was less effective in destroying scale than
any of the lime and sulphur mixtures. (See Table III.)

None of the pear trees of the orchard showed any injury
that could be ascribed to the spraying, though some branches
were killed by scale and winter. When examined October 22,
most of the trees had made good growth and there were few
scales on the new wood, though the old wood was well covered
with dead ones. The trees sprayed with the caustic soda solu-
tion were far more scaly than any of the others. There was but
little difference in effectiveness between formulas No. 2, No.
9, No. 10 and No. 14, though No. 9 was probably the least
efficient.

Wallingford Experiments.
The trees sprayed at Wallingford were seven years old, of
good size, and but slightly infested with the San Jose scale-
insect. The damage to the trees by the winter was slight.
The applications were made April 8. Ninety trees were
sprayed, using the following formula (No. 9) :

14 lbs. fresh finishing lime. 6 lbs. sodium sulphide.

6 lbs. flowers of sulphur. 40 galls, water.

14 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

The materials were weighed out, the lime placed in a barrel
and just enough cold water added to start it slaking. When
the lime began to slake the sulphur and sodium sulphide were
added and the mixture kept well stirred. Just enough cold
water was added to prevent the lime from becoming dry or
"burning," thus keeping the mixture hot in order to dissolve the
sodium sulphide, and as much of the sulphur as possible.
After the lime had slaked, a small amount of water was added
and the mixture allowed to stand for at least twenty minutes,
with occasional stirring. It was then dipped out, strained and
diluted. This preparation was of a dark muddy olive-green
color, becoming greenish yellow when diluted. Upon strain-
ing this into the pump barrel no more sediment remained than
with the boiled lime and sulphur mixture.

The spraying outfit consisted of a No. 6 "Hardie" pump
mounted on the side of a fifty-gallon barrel. The trees were
covered thoroughly. Upon drying, the coating was not as white
as on the trees sprayed with the boiled mixture (Formula No.
3). This, of course, was due to the smaller amount of lime
used in our mixture and the darker color which the sodium sul-
phide imparted to it.

About forty trees in the same block were sprayed with a
mixture made after formula No. 10.

This was prepared in the same way as the above mixture.
The additional amount of sulphur and sodium sulphide made
very little difference in the appearance of the mixture, making
it a trifle darker in color. The following table gives the chief
data:

Results at Wallingford.

Though 130 trees were sprayed here by the writers, the
owners of the orchard sprayed the remaining 9,000 trees with
boiled lime and sulphur mixture, using for the most part
formula No. 3. (See page 5.) Their work was done with
thoroughness and twigs were cut from some of the trees for
comparison with our tests. The mixture made after formula
No. 9 did not appear to stick on the trees as well as the boiled
mixture, and the figures show that it was less effective as a
scale-destroyer. Though where more sulphur and more sodium
sulphide were used (No. 10) the results were much better; the
average number of surviving scale-insects being smaller even
than where the boiled mixture was used.

SPRING SPRAYING, WALLINGFORD.

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1 6 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

The orchard was examined on October 26, and the trees were
found to be in a very satisfactory condition. It was difficult to
find living insects on any of the sprayed trees in the orchard.

Experiments at Southington.

The small peach orchard sprayed last year and described on
page 14 of bulletin 144 should be mentioned here. That half
of the orchard receiving lime and sulphur mixtures remained
quite free from scale, and though the trees suffered injury from
the winter, were in much better condition than the trees in the
other half of the orchard where whitewash was used and kero-
sene emulsion applied in August. The whitewashed trees went
into the winter in a badly infested condition and were killed,
or injured to such an extent that they were cut out in the
spring. Twigs and branches were dead.

The remaining trees, 100 in number, were sprayed on April
4 and 5. Seventy received boiled lime and sulphur. (See
formula No. 2, page 5.) The other trees were sprayed with
lime, sulphur and sodium sulphide, 18 with formula No. 9,
and 12 with formula No. 10.

A much larger peach orchard at Spring Lake farm, owned
by Mr. L. V. Walkley, was found to be seriously infested by
the scale-insect, and though winter injury was at first apparent
it was considered a good place for experimentation, and about
950 large trees and 1,500 small ones were sprayed with various
mixtures April 4-19. The boiled mixtures were cooked with
steam from the boiler of a Kinney "Safe" portable engine.
The data are presented in Tables V. and VI.

Results at Southington.
The percentage of living insects shown in Tables V and VI
are all low and would indicate that the mixtures were efficient
had not the winter killed such a large proportion of the scales.
On the whole, the mixtures adhered well to the trees and could
be seen on the trunks and larger branches when the twigs were
cut in June. The boiled mixtures remained perhaps longer
than those made without boiling, though the differences were
not great. The effect of the winter on this orchard makes it
difficult to draw any accurate conclusions regarding the
efficiency of the various mixtures used. It seems safe to say,
however, that the spread of the scale was greatly checked by

PLATE I.

a. The noon hour in spraying time. Portable boiling plant and outfits for
applying the lime and sulphur mixture.

b. Nearer view showing methods of mounting pump and barrel. The proper

method is shown at the right. This is an excellent outfit

for a rough orchard.

VIEWS IN ORCHARD OF HIGHLAND FRUIT CO., WALLINGFORD.

PLATE II.

a. Applying the mixture to infested pear trees.

b. Boiling the lime and sulphur mixture in a kettle or feed cooker.
WESTVILLE EXPERIMENTS.

PLATE III.

a. Improved stationary cooking plant of J. H. Hale, South Glastonbury.
Capacity of this plant is about 50 barrels of mixture per day.

b. The common method in Connecticut orchards. A portable engine with

boiler is placed near the orchard where water can be obtained. Steam

is conveyed to the barrels through common rubber hose.

STATIONARY AND PORTABLE STEAM COOKING PLANTS.

PLATE IV.

a. Some spray nozzles in common use. I. Single Vermorel : 2. McGowen
3. Bordeaux : 4. Double Vermorel : 5. Mistry : 6. Double Spramotor.

b. An excellent home-made
strainer and funnel.

c. Spraying a tree with a bucket pump.

This is an excellent outfit for the

garden and the city yard.

NOZZLES, STRAINER AND BUCKET PUMP.

SPRING SPRAYING, SOUTHINGTON.

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the treatment and that all the mixtures here used were fairly
efficient. The final examination made on October 26 showed
the trees to be almost free from scale, though the winter injury-
was more serious than was supposed early in the season.

Experiments at Milford.

On April 22-23, various mixtures prepared without boiling
were applied to 217 fruit trees and 256 currant bushes at
Milford. The spraying season was nearly at an end and the
buds were opening on plum trees, currant and gooseberry
bushes. The lime, sulphur and sodium sulphide mixture
(formula No. 7), lime and potassium sulphide (formula No.
4), lime, sulphur and caustic soda (formula No. 15), and
caustic soda solution (formula No. 13), lime and sodium sul-
phide (formula No. 6) were used in these tests.

Most of the trees and bushes were moderately infested with
scales, and some were killed or injured by the winter, so that
leaves did not start from the branches. In some cases growth
started from the upper portion of the trunks.

Data connected with these experiments are given in the
accompanying table.

Results at Milford.
Trees sprayed with mixtures No. 4 and No. 15 gave the
lowest percentage of living insects in June. Those receiving
No. 6 and No. 13 gave the highest. No. 6 probably washed
off sooner than the other mixtures containing lime, though
there was little difference in this respect between 4, 7 and 15.
Though no boiled mixture was employed here for comparison,
it certainly seems 'as if mixtures Nos. 4 and 15 gave about as
good results as could be expected of a boiled mixture. The
sprayed trees were examined October 25. Formulas Nos. 7,
4 and 15 gave very satisfactory results, the new growth of the
trees being mostly clean. Nos. 6 and 13 were less efficient and
more living scales were found on trees sprayed with these
preparations.

Connecticut Orchards Sprayed in 1904.

It is safe to say that over 100,000 fruit trees in orchards and

gardens were sprayed in Connecticut during 1904 with the

lime and sulphur mixtures. Mr. J. H. Hale sprayed about

16,000 trees in his orchards at Glastonbury and Sevmour ; Mr.

20 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

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MAKING THE BOILED MIXTURE. 21

C. E. Lyman sprayed 12,000 trees at Middlefield, and it has
already been mentioned that the Highland Fruit Co. of Walling-
ford sprayed their entire orchard of 9,000 trees. Other growers
who have done more or less spraying with the lime and sulphur
mixture are A. C. Sternberg, West Hartford ; C. I. Allen,
Terryville ; T. H. & L. C. Root, Farmington ; Barnes Brothers,
Yalesville; A. E. Plant & Son, Branford ; G. F. Piatt & Son,
N. D. Piatt & Son, Milford ; Hall & Barnes, Wallingford, and
many others.

In Keney Park, Hartford, a great deal of spraying was done
in the ornamental planting of trees and shrubbery, and the
writers are informed that the lime and sulphur mixture is con-
sidered preferable to any of the oils or soaps previously used
here for the purpose of killing the scale.

So far as can be learned,- the results of this spraying work
have been on the whole satisfactory. The boiled mixture has
been used in most cases, and the work done in the spring. The
care with which the mixtures are made and applied, the con-
dition of the trees, and the climatic conditions all affect the
final results.

Making the Boiled Mixture.
A portable steam boiler is probably the most convenient out-
fit for cooking the lime and sulphur mixture for the average
orchard. The boiler can be set up in the orchard, preferably
near a water supply, and the mixture cooked in open barrels.
Common rubber hose is more convenient than iron pipe for
conveying the steam to the barrels, as it can be removed more
readily. The mixture can then be applied as fast as it is made.
Each line of hose should be fitted with a valve. If there is no
spring or stream of water near the orchard it is not impracti-
cable to cart water to the boiler, as was done at Wallingford
by the Highland Fruit Co., or to cart the boiled mixture a mile
or more from the boiler to the orchard. Mr. Plant of Bran-
ford cooked the spraying mixture near his house, drawing
water in a spout directly into the cooking vats from a spring
on the hillside. From the boiler the mixture was carted in
tight casks into the orchard about a mile distant, drawn off
into the spray barrels and applied. The portable boiler can
be used in any moderate sized orchard, but is capable of cook-
ing material for large orchards. The Kinney "Safe" engine

22 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

with boiler is a common source of power on Connecticut farms,
and this has probably been used more than any other forms of
portable boilers for cooking the mixture, and has been very satis-
factory ; one of 5 h. p. capacity furnished steam to cook all of
the mixture used in spraying 9,000 good sized peach trees in the
orchard of the Highland Fruit Co. at Wallingford. An outfit
of similar size and pattern was used in an orchard of 12,000
trees by Mr. C. E. Lyman of Middlefield. Some of the
largest orchards, however, are provided with more permanent
stationary cooking plants. That of Barnes Brothers of Yales-
ville has already been described and figured in the Report of
this Station for 1902, page 120. A much more elaborate out-
fit has been devised by Mr. J. H. Hale of South Glastonbury.
(See plate III. a.) Mr. Hale's plant consists of a horizontal
boiler of 20 h. p. connected by pipes with eight barrels in
which the materials are boiled. Above each barrel the steam
pipe has a valve, and at the bottom of the barrel the pipe is
fitted with a 4-way connection containing short pipes drilled
with small holes for the escape of the steam. By this arrange-
ment no stirring is necessary. The bottom of each barrel is
also connected by pipe to the water supply, and by means of
valves the boiled mixture can be diluted, and drawn off through
the same pipes into the spray barrel or into casks to be carted
away. This appears to be a good type of a large cooking
plant.

It is not essential, however, for the owner of a small orchard
to go to the trouble and expense of fitting up an elaborate out-
fit of this sort. Neither is it necessary to employ the portable
boiler, as the mixture can be cooked very satisfactorily with
steam from the heating plant of the house ; in a set kettle or
portable feed cooker, such as are in use on many farms, or even
in a kettle on the stove, where small quantities are required. A
feed cooker used in our Westville experiments is shown on
plate II. b.

Finishing lime should be used where possible, as this slakes
completely, leaving little sediment to clog strainer and nozzles.
It comes in hard white lumps, costs more than mortar lime and
generates more heat in slaking. It is important that the lime
should be properly slaked, for upon this depends in a large
measure the amount of sediment. Water should be added to

MAKING THE BOILED MIXTURE. 23

the lime only as needed to prevent burning. Lime needs air
as well as water in order to slake well. Therefore too much
water will hinder the slaking process or "drown" it, as the
bricklayer says. Constant stirring is also required to prevent
"burning" in spots. The weight of the lime should equal
or slightly exceed that of the sulphur. A great excess injures
the mixture. Sulphur should be used either in the form of the
sublimed "flowers," or the finely ground "light sulphur flour."
The particles are somewhat smaller in the sublimed product,
but there is a greater tendency to become lumpy under pressure
and this, of course, retards solution. The writers believe that
the light flour is the better, all things considered.

The sulphur should be added to the lime before slaking, as
the heat of the slaking lime can be utilized to help dissolve the
sulphur, though this heat alone will probably dissolve only a
small portion of it. It is well to stir the materials thoroughly
during the slaking process to prevent "burning" of the lime.
Water should be added as needed, and after the lime is slaked
the barrel can be filled about one-third full of water and the
steam or heat applied. The mixture should boil for a period
of time varying from forty-five to sixty minutes. Of course,
the heat can be applied during the slaking process, and in this
case it should be turned on for at least an hour to make sure
that the sulphur is well dissolved. In our Bridgeport experi-
ments, the sulphur was made into a paste by working it over
with the hands, warm water being used. This prepared the
sulphur for more immediate action, and the materials were
boiled only thirty minutes and very little or no sulphur remained
undissolved. But in most cases it will be found more economi-
cal to add dry sulphur to the slaking lime and boil it for a longer
time. There should not be more than a pint of sediment for
each barrel of mixture if properly made, and the mixture should
be strained when put into the spray barrel.

Salt may be added to this mixture and is still used in some
orchards, though in most cases it is omitted. In previous tests
conducted by us and by many other experimenters, salt was
found to have no value either in making the mixture more
adhesive or in rendering it more destructive to the scale-
insects.

24 connecticut experiment station, bulletin 1 46.

Making the Mixture Without Boiling.

The fact that the ordinary lime and sulphur mixture requires
boiling has kept many from using it, in spite of the small cost
of the mixture, even when boiled. In large orchards, where
suitable outfits can be procured, the question of boiling is not
such a serious one, but in hundreds of small orchards and gar-
dens the trees would be sprayed if some easily made mixture
could be used. There is a demand for a mixture that can be
prepared without hot water, and this has prompted us to try
several things with the view of possibly supplying this demand.

Last year we used potassium sulphide and found it a valuable
addition to our list of scale insecticides. It has been used the
present season with good results. It is too expensive for large
spraying operations, but is very convenient for spraying a few
small trees or shrubs near the buildings or in a city yard. Know-
ing that sodium compounds are usually cheaper than potassium
compounds, and have similar properties, we sought the former,
and through considerable correspondence we learned that two
grades of sodium sulphide could be obtained at a low price. The
crystallized form contained less than 30 per cent, of sodium sul-
phide and cost 1% cents per pound in 500 lb. barrels. The fused
form has nearly 60 per cent, of sodium sulphide and costs
2^4 cents per pound in drums of over 700 lbs. Both kinds were
tested in the laboratory and mixtures with lime were made from
each and sprayed upon trees. The mixture from the crystal-
lized sulphide did not stick as well as that from the fused, and
as it contained such a small quantity of sodium sulphide, was
not employed extensively. The fused sulphide, however,
promised to be of value and was used quite extensively in these
experiments. The worst feature about it is the form in which
it comes — in a fused mass, hard as a rock. When freshly
broken it is of a reddish color, resembling the mineral cinnabar.
On exposure to the air it soon blackens and gives off a strong
odor of sulphuretted hydrogen. The large lumps are hard to
dissolve, but the finely pulverized material is very soluble in
cold water. The entire mass was broken with hammers into
small pieces — no larger than a hen's egg. In this form it would
nearly all dissolve when added to the slaking lime, but in
uniting with the lime to form calcium sulphides caustic soda
was also formed, and the mixture was so very caustic that it
went through the skin, making sore spots wherever it struck.

MAKING THE MIXTURE WITHOUT BOILING. 25

In our laboratory tests the dissolved sodium sulphide was
found to be an excellent solvent of sulphur, exceeding" caustic
soda when in cold solution, though the latter would dissolve
more sulphur if heated. In discussing the properties of this
sodium sulphide, Director Jenkins suggested to the writers that
by using this as a solvent for sulphur in connection with lime,
the causticity would probably be much reduced — which was
found to be the case.

An effort then was made to prepare a mixture without boil-
ing based on the same cost of materials as the boiled mixture.
Formula No. 7 is the result, and No. 8 was simply a test of
larger quantities of sulphur and sodium sulphide with the same
amount of lime. When prepared after either formula, this
mixture is no more caustic or unpleasant to handle than the
boiled lime and sulphur mixture, and while we are not yet pre-
pared to state that it is just as good, it certainly has given favor-
able results that warrant further trial. If this sodium sul-
phide could be obtained in pulverized form it would be much
more convenient to use, and we have taken up the matter with
the manufacturers in Germany to try and bring it about.

In making the mixtures without boiling, the unslaked finish-
ing lime was used. This generates more heat in slaking than
the mortar lime, and heat aids in dissolving the sulphides. The
best solution resulted when the greatest amount of heat was
produced by the slaking lime. The light sulphur flour is the
grade of sulphur best adapted for the unboiled solutions. As
has already been mentioned, this does not form as many dry
lumps as the flowers of sulphur. Boiling will break up some
of these lumps, but it is more necessary in the unboiled mixture
to use the form that is least inclined to become lumpy.

Cold water was used in most cases. Warm, or hot water,
of course, assists greatly in slaking the lime and dissolving the
sulphides. But it requires nearly as much of an outfit to heat
the water as to boil the lime and sulphur mixture, and the chief
object of an unboiled mixture is to do away with such an outfit.

Lime and Potassium Sulphide Mixture.

( 20 lbs. lime.
Formula No. 4. -J 20 lbs. potassium sulphide.
( 40 galls, water.

This can be prepared in two ways, either of which is satis-
factory.

26 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

1. Place the weighed potassium sulphide in a half-barrel and
add three or four pails of water. Stir occasionally. Place the
lime in a barrel and slake carefully, the same as for a boiled
mixture. When the potassium sulphide has all dissolved add
it to the slaked lime, with water to make about one-third the
required volume. Then strain the mixture into the pump
barrel, dilute to make the right proportion and apply to the
trees.

2. Weigh out the materials. Put the lime in a barrel and
start it slaking. When it begins to slake vigorously add the
dry sulphide. Then stir the mixture vigorously and add just
enough water to keep the lime from burning. After the lime
has slaked, add a small quantity of water and allow the mix-
ture to stand for a short time, with frequent stirring. Then
dilute and apply.

The above formula has been given in several Experiment
Station bulletins with directions that the potassium sulphide be
dissolved in warm water and the lime slaked with this solution.
We do not recommend this method, because the sulphide when
dissolved makes a soapy, caustic solution which, when added to
the lime, immediately coats over the lumps, excluding the air
and checking the slaking process. Besides, there is practically
nothing gained by this method.

Lime, Sulphur and Sodium Sulphide Mixture.

i1u ,. f 20 lbs. lime.

20 lbs. lime. 1 „ -,, , ,

,, ,. , , ., v, 0 11 lbs. sulphur.

20 lbs. sodium sulphide. No. 8. ■< tt ,, j ■ „ 1 i,-j„

„ . r 11 lbs. sodium sulphide.

40 galls, water. n . r

t & ■ ^ 40 galls, water.

I onlh* lime ( 14 lbs. lime.

1 z(j ids. lime. 1 r it, , 1 i

No. 6. -< 10 lbs. sodium sulphide. No. q. \ , ,, J. ' , , . ,

) ,, * * J o lbs. sodium sulphide.

( 40 galls, water. n •„*

v ^ ° ^ 40 galls, water.

f 20 lbs. lime. f 14 lbs. lime.

N J 6 lbs. sulphur. N J 11 lbs. sulphur.

" '' 1 6 lbs. sodium sulphide. ' " j 11 lbs. sodium sulphide.

[_ 40 galls, water. [ 40 galls, water.

These mixtures are made practically in the same way as
the last preparation. It is important to use as little water as
possible in slaking the lime and to let the lime get well started
before the other ingredients are put in.

Weigh the materials, put the lime in a barrel, add water, and
when it begins to slake vigorously add the dry sulphur and
lumps of sodium sulphide. Keep the whole well stirred. When
the lime is slaked, add a few pails of water, and let the solution

MAKING LIME, SULPHUR, AND SODIUM SULPHIDE MIXTURE. 2J

stand for about twenty minutes. It can then be strained,
diluted, and sprayed upon the trees. The sodium sulphide used
in these mixtures is dissolved by the water, aided by the heat
of the lime. The caustic properties of the sulphide and lime,
together with the heat, dissolve the sulphur flour, thus forming
sulphides of lime similar to those formed in a boiled lime and
sulphur mixture.

This appears much like the regular boiled mixture, except
that it is olive-green in color instead of yellow.

Lime, Sulphur and Caustic Soda.

f 14 lbs. lime.

it 1 xt ) 14 lbs. sulphur.

Formula No. 14. ■< Z iu„ *■ j

^ 7 lbs. caustic soda.

^ 40 galls, water.

In this mixture caustic soda is added to assist in dissolving
the sulphur. Start the lime slaking and add the sulphur and
caustic soda. The caustic soda causes violent boiling of the
mixture, and water must be added at intervals to prevent the
mixture from boiling over the top of the barrel. The mixture
becomes reddish in color very soon after adding the caustic
soda, and by the time the action ceases the color reaches deep
reddish brown. Then dilute with water and apply. This mix-
ture is convenient and effective. Common household lye can
be used instead of caustic soda.

This is similar to the mixture originated at the New York
(Geneva) Experiment Station and used extensively there in the
orchards. (See Bulletins 228 and 247 N. Y. Expt. Station,
Geneva, N. Y.)

Caustic Soda and Water.

N j 8 lbs. caustic soda. >r ( 7 lbs. caustic soda.

' I 40 galls, water. ' *' ( 40 galls, water.

Dissolve the weighed amount of caustic soda in water and

dilute ready for use. This solution is very disagreeable to use ;

every drop that strikes the skin makes it smart violently.

Outfit for Applying the Mixture.
Spraying with the lime and sulphur mixture is looked upon
as one of the arduous and disagreeable jobs of the fruit
grower. The spring spraying comes at a time when each day
brings the grower nearer the regular spring work. Especially
if a few days of bad weather occur, the spraying must be
rushed as fast as possible. The above reasons alone are suf-

28 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

ficient to show that the best and most practical outfit procurable
should be used, to make the work go as smoothly and pleasantly
as possible and to obviate the loss of time from the breaking
down and the giving out of an inadequate spraying outfit.

As spraying is more and more practiced, the good and bad
points of spray pumps and their accessories are being brought
out.

Many inquiries have come to the station during the past
year in regard to the best kinds of spray pumps, nozzles, etc. It
seems, therefore, advisable to describe a practical outfit in this
bulletin.

Pump, Barrel and Carriage.

It has not yet been demonstrated that power sprayers are as
practical or can take the place of the hand barrel pump for
orchard work in Connecticut. The first thing to consider is
the pump, which should be of large size, furnishing ample
pressure to supply at least two lines of hose fitted with double
Vermorel nozzles. This should be made so that when it is
mounted on the end of a fifty gallon cask, the highest point
should be the fulcrum or post on which the pump handle or
lever works. This should be just high enough to give the
handle a good working distance, — that is, when pushed down
it will just clear the chine of the barrel. The air chamber
should be under the handle post, the larger part of it being
in the barrel out of sight. It is essential that the cylinder be
of good size and the plunger must be packed in such a manner
that it can be tightened quickly and easily. The valves should
be made as simple as possible. It must be possible to take the
whole pump apart and put it together with a monkey wrench.
The lime and sulphur mixture requires a pump with an agitator
that will keep the liquid well mixed.

There are several pumps on the market which are of this
type. One which has recently been brought to the attention of
the Connecticut fruit grower is the "Hardie." This pump has
several features worth pointing out. The plunger is made so
the packing can be tightened by turning the plunger rod with
a wrench without removing it from the cylinder. The plunger
consists of two cone-shaped pieces, one screwing upon the
other; the groove between them is wound full with cotton
waste. This is pushed into the cylinder and a projection on
the lower cone holds it stationary while the upper one is screwed

PUMP, BARREL AND CARRIAGE. 29

down by turning the rod. This crowds the packing together
until it fills the cylinder. The mixture enters the pump through
a strainer at the side instead of the bottom, and the agitator
works up and down in front of this place, keeping the strainer
from becoming clogged.

Among the pumps used in Connecticut that have given fairly
good satisfaction are the "Eclipse," manufactured by the Mor-
rill & Morley Co., Benton Harbor, Mich. ; the pumps manu-
factured by the Goulds Mfg. Co., Seneca Falls, N. Y., of which
the "Pomona" is a type ; and the "Century," manufactured by
the Deming Co., Salem, Ohio. These pumps all have some
good features as well as weak ones. All pumps should be made
so that they can be removed from the barrel more readily.

Plate I. b. shows one of the most practical ways of mounting
a pump. The pump is mounted on the side of the barrel
instead of the end. One can readily see many advantages in
this method. The barrel is less liable to tip over in rough
places. It is much easier to fill than when mounted on the
end. When a strainer like the one described is used a hole
only large enough to take in the pipe is necessary in filling the
barrel. This can be plugged tightly. A drag or sled is made
of two pieces of 4 x 6 inch scantling for runners, and spiking
a platform of plank to the upper edge of them. The front
ends of the runners are rounded. The barrel is placed cross-
wise of this sled on wooden blocks cut to fit the curve of the
barrel and fastened to both barrel and sled. There should be
standing room behind the barrel for the man who pumps. A
piece of scantling is placed close to each side of the barrel and
fastened to the wooden blocks, thus forming a frame around
the barrel, securely fastening it to the sled. Iron straps may
also be used for holding the barrel in place. Plate I. b.
shows two pumps. One is mounted in the manner just
described, the other is placed lengthwise of the runners. It
took but a short time to prove which was the practical way of
mounting. Where it was mounted lengthwise there was more
chance for the barrel to tip over. The handle was at the side
and liable to catch on the trees and branches in going through
the orchard. The man pumping was continually in the way
of the hose on one side. The hose leads from the back and
front of the outfit instead of the sides, as in the other case,
consequently the hose was continually bent at the point of
attachment and soon gave out.

30 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

When the barrel was mounted crosswise of the drag, the
man pumping stood back on the platform out of the way of
the men handling the hose.

Pump manufacturers make outfits consisting of small-sized
barrels holding from 15 to 25 gallons, mounted on wheels, for
hand use in the garden. The ordinary barrel pump is used in
these outfits, though sometimes of a smaller size than would be
chosen for orchard work. These hand wheel outfits are most
useful in the home garden of four or five acres. For still
smaller places, like the ordinary city yard, or for spraying a
few large trees, a bucket pump costing from four to six dollars
is perhaps the best form of outfit. Such a pump is shown on
plate IV. c. and can be used with any wooden pail or bucket.
The small compressed air pumps on the market, and the knap-
sack pumps, will answer the purpose, but most of them are
badly corroded by the lime and sulphur mixtures.

Clean water should be run through pump, hose and nozzles
at the end of each day's work, and at the end of the spraying
season the pump and nozzles should be well cleaned and oiled
to prevent corrosion.

Hose.

For general spraying work, we prefer half-inch rubber hose
in lengths of not less than 25 feet. Where two lines of hose
are used it is frequently of advantage to have one of them 50
feet long for reaching the opposite side of trees or for working
a long distance behind the pump. Most of the pumps are sent
out with a piece of hose seven or eight feet in length, which
is altogether too short for practical work. This hose, though
of good quality, usually costs 16 or 18 cents per foot, making
it too expensive for orchard use. We have been using a grade
of hose which can be purchased from the rubber stores in
the larger cities of Connecticut for eight or nine cents per
foot. This hose has been very satisfactory, withstands the
pressure, and for dragging about in the orchard seems to wear
about as long as the more expensive hose. The points of
breakage are always near the ends where sharp bending occurs.

Extension Rods.
For reaching into the trees it is necessary to use some form
of rod six to ten feet long, and the lightest and best is a
hollow one which screws onto the end of the hose and permits

HOSE, EXTENSION RODS AND NOZZLES. 3 1

the liquid to pass through it. Bamboo rods have been designed
for this purpose, each consisting of a brass tube inside of a
piece of bamboo. Screw connections are made between the
brass rod and the hose at one end, while the other end takes
the nozzle. The hose connection should also have a stop cock
or "shut off" to avoid wasting the spray mixture. The bam-
boo extensions are light and convenient, but not durable, as the
screw connections soon break off or the bamboo splits or becomes
loosened on the brass rod. For this reason many orchardists
have adopted an extension made of quarter-inch gas-pipe.
Though heavier and harder to hold in the hand on account of
the smaller diameter, the gas-pipe rods are more durable and
considerably cheaper than the bamboo extensions.

Nozzles.
The double Vermorel nozzle has been used probably more
than any other in orchard spraying and has given satisfaction.
For large trees the MacGowen is preferred by some operators.
During the past season the Gould's Mfg. Co. has put upon the
market a new nozzle called the "Mistry." The "Mistry" is
a large and somewhat complicated nozzle that gives a fine
spray. The greatest disadvantage of this nozzle is that the
caps wear out very quickly and often need replacing once or
twice each season. The lime and sulphur mixture, when forced
in a thin stream under great pressure against the cap, will soon
wear and enlarge the opening on any of these nozzles. If the
caps could be made of hard steel instead of brass they would
last much longer. Some growers praise the "Mistry" highly,
while others prefer the double Vermorel. The Spramotor
Co. has originated a nozzle fitted with hard steel disks, through
which the openings are made. These disks can be replaced easily
and while we have not yet given these nozzles a practical trial
in the orchard, they appear to work nicely and throw an excel-
lent spray. One man who makes a business of spraying trees
informs me that the Spramotor is the best nozzle that he can
find for his work. The nozzles of the "Bordeaux" and
"Seneca" type give a fan-shaped spray, are heavy and not
readily cleaned after being set, and the handles are hook-shaped
and get caught in the branches. For these reasons they are not
well adapted to orchard work. These nozzles are all shown
on plate IV. a.

32 CONNECTICUT EXPERIMENT STATION, BULLETIN I46.

Strainer and Funnel.
We have found a home-made strainer the most satisfactory,
as the ready-made strainers are not of the proper size or shape
for practical use. The strainer and funnel that we have adopted
consists of a common wooden pail with the bottom reinforced and
a piece of one and one-half inch iron gas-pipe screwed through
it. About half-way up on the inside of the pail is tacked a
circular piece of iron wire cloth, having at least 20 meshes per
inch. A finer strainer is not needed and only hinders the work,
as the men must wait for the liquid to go through. This kind
of a strainer is always convenient, will hold a pailful at a time,
and there is more straining surface than if the wire was placed
at the bottom. It is shown on plate IV. b. The materials for
such a strainer cost not more than fifty cents, and the wire
cloth can be obtained from the wire stores in New Haven and
Hartford.

SUMMARY.

1. This station conducted spraying experiments in Bridgeport, New
Haven, Westville, Wallingford, Southington and Milford during the
past season, to kill the San Jose" scale-insect. Over 4,000 trees were
treated. Nearly 800 were sprayed in December and the remainder in
March and April. Fifteen different formulas were used in the prepara-
tion of the materials ; mixtures of lime and sulphur were used chiefly.

2. The winter injury to trees was very serious, many orchards being
permanently damaged. This makes it impracticable to express in
exact figures in all cases the results of these experiments. Fifty per
cent, of the San Jose scale-insects were also destroyed by the winter
in many localities.

3. Fall or early winter spraying gave good results, both where the
boiled and unboiled lime and sulphur mixtures were used, and will
doubtless soon be practiced by fruit-growers.

4. The boiled mixture of lime and sulphur, using as much or a little
more lime than sulphur, is probably as effective and as inexpensive as
any mixture for ordinary orchard work. Of the mixtures made without
boiling, the potassium sulphide and lime is excellent for a few small
trees or shrubs, but is rather expensive for spraying large trees ; the
lime, sulphur and sodium sulphide mixture is a promising one, worthy
of further trial, and giving good results in these experiments. Lime
and sodium sulphide make a mixture that is less efficient than those
just mentioned, nearly as caustic in its action as caustic soda, and
workmen need protection in handling it. At present sodium sulphide
(fused), though inexpensive, is not put up in a convenient form for
orchard use.

5. Caustic soda as used in these tests did not give as good results as
most of the other mixtures. Its caustic action makes it hard to handle
and the hands and faces of the men should be protected,

6. Probably 100,000 fruit trees in Corinecticut orchards and gardens
were sprayed with the lime and sulphur mixtures during the Spring of
1904. The results were generally satisfactory.

7. A satisfactory spraying outfit consists of hand pump in barrel
mounted on drag or wagon and fitted with two lines of half-inch hose
at least 25 feet long, extension rods and nozzles, as described in the
foregoing pages.

University of
Connecticut

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Full text of "San José scale-insect experiments in 1904"

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