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FOREST HEALTH PROTECTION
INTERMOUNTAIN REGION

Regional Office
324 - 25th Street
Ogden, Utah 84401
(801) 625-5257
FAX (801) 625-5127

William W. Boettcher Director, State & Private Forestry
Dave Baumgartner Pesticide Coordinator

Boise Field Office
1249 Vinnell Way, Room 240
Boise, Idaho 83709
(208) 373-4220

FAX (208) 373-4111
Dayle D. Bennett Field Representative
James T. Hoffman Pathologist
Ralph W. Thier . Entomologist
Julie C. Weatherby Entomologist
Joy C. Roberts Computer Specialist
K. Andrew Knapp Remote Sensing Specialist
Philip J. Mocettini, Jr. Biological Technician
Richard L. Halsey GIS Specialist

Thomas N. Barbouletos Forester

iil

Ogden Field Office
4746 South 1900 East
Ogden, Utah 84403
(801) 476-9720
FAX (801) 479-1477

Leon LaMadeleine Plant Pathologist/

Field Representative
John A. Anhold Entomologist
Dawn E. Hansen Entomologist
A. Steven Munson Supervisory Entomologist
John C. Guyon Plant Pathologist
Valerie L. DeBlander Forestry Technician
Alan D. Dymerski Forestry Technician
Laura Dunning Program Assistant

The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the
basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and
marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require
alternative means for communication of program information (Braille, large print, audiotape, etc.) should
contact USDA's TARGET Center at 202-720-2600 (voice and TDD).

To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326-W, Whitten

Building, 14th and Independence Avenue, SW, Washington, DC 20250-9410 or call (202) 720-5964 (voice or
TDD). USDA is an equal opportunity provider and employer.

TABLE OF CONTENTS
Subject
Introduction
Summary of Conditions
Status of Insect Conditions - Native
Status of Insect Conditions - Non-native
Status of Stem and Branch Diseases - Native
Status of Root Diseases - Native
Status of Foliage Diseases - Native
Status of Stem and Branch Diseases - Non-Native
Status of Nursery Diseases
Special Project Update

Recent Publications

Appendix A - Tables *

Appendix B - Figures *

Page

14
15
16

*If the appendices are not included in this document, they can be obtained under separate cover

from the Internet at http://www.fs.fed.us/r4/health/cond97fm.htm or from the Boise Field

Office at the address on page iii.

Appendix A - Tables
1. Number of acres aerially surveyed by administrative area during 1997.
2. Status of mountain pine beetle-caused mortality by state during 1997.
3. Status of spruce beetle-caused mortality by state during 1997.
4. Status of Douglas-fir beetle-caused mortality by state during 1997.
5. Status of western pine beetle/Ips beetle-caused mortality by state during 1997.
6. Status of J effrey pine beetle-caused mortality by state during 1997.
7. Status of subalpine fir mortality complex by state during 1997.
8. Status of fir engraver beetle-caused mortality by state during 1997.
9. Number of trees killed and acres affected by bark beetles on National Forests of Region 4
during 1997 as determined by aerial detection surveys.
Appendix B - Figures
1. Trees killed by bark beetles in Region 4 between 1981 & 1997.

2. Acres defoliated by western spruce budworm & Douglas-fir tussock moth in Region 4
between 1960 & 1997.

3. Tree mortality associated with mountain pine beetle and Jeffrey pine beetle in Region 4 -1997
aerial detection surveys.

4. Tree mortality associated with spruce beetle in Region 4 - 1997 aerial detection surveys.
5. Tree mortality associated with Douglas-fir beetle in Region 4 - 1997 aerial detection surveys.

6. Tree mortality associated with western pine beetle and /ps beetle in Region 4 - 1997 aerial
detection surveys.

7. Tree mortality associated with fir engraver beetle and subalpine fir mortality complex in
Region 4 - 1997 aerial detection surveys.

INTRODUCTION

This report summarizes the status of forest insect and disease activity in the Intermountain
Region (Region 4), comprising parts of Idaho, Utah, Nevada, Wyoming and California. Insect
status is based largely on aerial detection surveys conducted over approximately 21,000,000
acres of forested lands in 1997. Disease status is based largely on ground observations and
surveys. General insect and disease information is summarized in the Summary of Conditions.

The Special Project Update summarizes on-going studies conducted by Forest Health Protection
in cooperation with other Regions, Forest Service Research, and universities.

Recent publications are listed to assist the reader in locating recent pest information of interest.

Two appendices include various tables and figures. Acres surveyed by administrative area
during 1997 are summarized in Table 1. Numbers of trees killed by major bark beetles and
affected acres are displayed in Tables 2 through 9. Figure | depicts the relative number of trees
killed by bark beetles in Region 4 between 1981 and 1997. Figure 2 depicts acres defoliated by
Douglas-fir tussock moth and western spruce budworm in Region 4 between 1960 and 1997.
Figure 3 displays the areas aerially surveyed in the Region during 1997. General location of
major insect activity is shown in Figures 4 through 8.

If the appendices are not included in this document, they can be obtained under separate cover
from the Internet at http://www.fs.fed.us/r4/health/cond97fm.htm or from the Boise Field
Office at the address on page 111.

SUMMARY OF CONDITIONS

Mountain pine beetle-caused tree mortality increased in southern Idaho and western Wyoming and
decreased in Utah. regionwide, 33,000 trees were killed in 1997, compared to 29,100 trees killed in 1996.
The largest outbreaks are located on the Payette National Forest in Idaho and on the Dixie and Manti-
LaSal National Forests in Utah. A complex of mountain pine beetle and roundheaded pine beetle
continued to kill ponderosa pine trees on the Manti-LaSal National Forest in southern Utah. An increase
in mortality of whitebark and limber pine trees attributed to mountain pine attack occurred in 1997 with
6,700 trees killed. The largest outbreaks were located on the Payette and Bridger-Teton National Forests
in southern Idaho and western Wyoming, respectively.

Jeffrey pine beetle activity declined significantly on the Toiyabe National Forest and nearby Federal, State
and private lands in the Tahoe Basin.

Spruce beetle caused mortality decreased slightly with approximately 70,700 trees killed in 1997
compared to 82,500 trees killed in 1996. No significant mortality was recorded in southern Idaho or
western Wyoming. In Utah, mortality decreased on the Manti-LaSal and Fishlake National Forests and
remained static on the Dixie National Forest. Mortality is expected to increase on the Dixie and Fishlake
National Forests as 1997 attacks become visually apparent in 1998.

Douglas-fir mortality, caused by the Douglas-fir beetle decreased three fold with 21,700 trees killed in
1997 compared to 62,700 trees killed in 1996. Decreases in mortality occurred in southern Idaho and
western Wyoming while mortality increased in Utah. Outbreaks are located on the Boise, Salmon-
Challis, Payette, Sawtooth and Targhee National Forests in southern Idaho. In Utah, outbreaks are located
the Manti-LaSal, Ashley, Dixie, Fishlake, Uinta and Wasatch-Cache National Forests.

Western pine beetle caused mortality of ponderosa pine remained static with 4,900 trees killed in 1997
compared to 4,300 trees in 1996. Mortality is located on the Boise, Payette, and Sawtooth National
Forests in southern Idaho. Pine engraver beetle activity was frequently associated with western pine
beetle infestation. A complex of western balsam bark beetle, twig beetle, secondary bark beetle, wood
borer, engraver beetle, environmental conditions, and disease pathogens continues to damage and kill
subalpine fir throughout the Region. Mortality levels increased in 1997 with 133,000 dying trees
observed, while in 1996, 418,800 trees were killed. Mortality occurs throughout the host type, affects
trees of all size classes and currently is the most widespread cause of visible mortality in the Region.

Fir engraver beetle mortality decreased in Idaho and Nevada, and increased in Utah. Regionwide, 22,600
true fir trees were killed in 1997 compared to 46,100 trees in 1996. Much of this decrease is attributed to
a decline in activity on the Toiyabe National Forest in Nevada. Outbreaks are located on the Toiyabe
National Forest in Nevada, the Manti-LaSal and Uinta National Forests in Utah, and on the Boise National
Forest in southern Idaho.

Foliage diseases of Populus species were epidemic again in 1997. Defoliation by the fungus Marssonina
was common throughout Utah and southern Idaho.

For the fourth consecutive year Gambel oak along the Wasatch Front in northern Utah has suffered
notable defoliation caused by fall cankerworm. Approximately 4,900 acres of visible defoliation were
recorded.

Status of Insect Conditions
Native
Defoliators
Douglas-fir tussock moth Orgyia pseudotsugata

Location: Idaho, Nevada, Utah
Host: Douglas-fir, True firs

No visible defoliation from Douglas-fir tussock moth was observed in the Region during 1997.

Western spruce budworm Choristoneura occidentalis

Location: Idaho, Utah, Wyoming
Host: Douglas-fir, True firs

No visible defoliation from spruce budworm was observed in the Region during 1997.

Cooley spruce gall adelgid Adelges cooleyi

Location: Idaho, Utah, Wyoming
Host: Spruce, Douglas-fir

This adelgid was found in forested stands and ornamental trees throughout the Region; impact is
greatest on ornamental spruce trees. On Douglas-fir, the alternative host, infested needles often
develop a yellow spot and twist at the point of attack.

Fall cankerworm Al/sophila pometaria

Location: Utah
Host: Gambel oak

Defoliation on gambel oak (Quercus gambellii) occurred along the Wasatch Front in northern
Utah from Spanish Fork to Brigham City. Approximately 4,900 acres of moderate to heavy
defoliation ranging from less than one to several hundred acres were observed in the spring of
1997. This is the fourth consecutive year of this defoliation.

Pine sawflies Neodiprion sp.

Location: Idaho

Host: Ponderosa pine

Defoliation of ponderosa pine caused by a sawfly was detected throughout the Little Weiser river
drainage on the Payette National Forest.

Sagebrush leaf beetle Trirhabda sp.

Location: Idaho
Host: Sagebrush

7 Heavy defoliation of sagebrush caused by a leaf beetle was detected in rangeland south of Twin
Falls, Idaho.

Xyelid sawfly Xyella sp.

Location: Idaho
Host: Ponderosa pine

Localized populations of this sawfly were detected feeding on pine pollen in the Boise River
drainage on the Boise National Forest.

Bark beetles

Douglas-fir beetle Dendroctonus pseudotsugae

Location: Idaho, Utah, Wyoming
Host: Douglas-fir

Mortality decreased regionwide, with 21,700 trees killed in 1997 compared to 62,700 in 1996.
Outbreaks were located on the Sawtooth, Boise, Salmon-Challis, Caribou, Targhee and Payette
National Forests in southern Idaho. In Utah, tree mortality increased with 12,600 trees killed in
1997. Outbreaks were located on the Manti-LaSal, Ashley, Dixie, Fishlake, Uinta, and
Wasatch-Cache National Forests. Mortality on the Bridger-Teton National Forest in western
Wyoming decreased from 1,500 trees in 1996 to 900 trees in 1997.

Fir engraver beetle Scolytus ventralis

Location: California, Idaho, Nevada, Utah
Host: Grand fir, Red fir, Subalpine fir, White fir

Regionwide, mortality decreased significantly with 22,600 trees killed in 1997 compared to
-46,400 trees in 1996. Most of this decrease can be attributed to a decline in tree mortality on the
Toiyabe National Forest and on Federal, State and private lands in the Tahoe Basin Management

area. In southern Idaho, mortality remained low with 300 trees killed. Fir engraver beetle
activity in Utah increased with 20,000 trees killed in 1997 compared to 12,300 trees killed in
1996. The largest outbreak was located on the Manti-LaSal National Forest where 9,800 trees
were killed. Activity was also located on the Uinta, Dixie, and Fishlake National Forests.

Jeffrey pine beetle Dendroctonus jefferyi

Location: California, Nevada
Host: Jeffrey pine

A significant decline in Jeffrey pine beetle activity was observed on the Toiyabe National Forest
and Tahoe Basin Management area with only 300 trees killed in 1997 compared to 4,100 trees in
1996.

Mountain pine beetle Dendroctonus ponderosae

Location: Idaho, Nevada,Utah, Wyoming
Host: Limber, Lodgepole, Jeffrey, Ponderosa, Whitebark pines

Mountain pine beetle-caused mortality increased from 29,100 trees in 1996 to 35,000 trees in
1997. The largest outbreak in the Region was located on the Payette National Forest in southern
Idaho where 7,500 lodgepole pine trees were killed. Some of this mortality was associated with
recent wildfire activity. Elsewhere in southern Idaho significant mortality occurred on the
Caribou and Sawtooth National Forests. Small outbreaks occurred on the Boise, Salmon-Challis,
and Targhee National Forests. In Utah, 10,000 trees were killed during 1997 opposed to 29,100
trees in 1996. The largest outbreaks were located on the Dixie and Manti-LaSal National Forests
where 3,900 and 1,100 ponderosa pine trees were killed, respectively. Smaller outbreaks were
located on most other National Forests in Utah. On the Bridger-Teton National Forest in western
Wyoming, 1,900 lodgepole pine trees were killed in 1997.

Mortality of whitebark and limber pine attributed to mountain pine beetle attack continued to
occur with 6,100 trees killed in the Region. The largest outbreaks were on the Payette National
Forest in southern Idaho with 2,800 trees killed, the Bridger-Teton National Forest in western
Wyoming, and the Manti-LaSal National Forest in Utah.

Pine engraver beetle /ps pini

Location: Idaho, Nevada, Utah
Host: Lodgepole, Ponderosa pine

Mortality due to pine engraver beetle remained static throughout the Region. Activity is often
associated with western pine beetle. In Utah, populations were found in slash of ponderosa and
lodgepole pine.

Roundheaded pine beetle Dendroctonus adjunctus

Location: Utah
Host: Ponderosa pine

Ponderosa pine mortality is being caused by this beetle on the Dixie and Manti-LaSal National
Forests.

Spruce beetle Dendroctonus rufipennis

Location: Idaho, Utah, Wyoming
Host: Spruce

Spruce mortality decreased slightly from 1996 levels with 70,700 trees killed Regionwide. The
largest infestations were located in Utah where 69,900 trees were recorded. Mortality was
heaviest on the Dixie, Fishlake, and Manti-LaSal National Forests. No significant mortality was
observed in southern Idaho National Forests or on the Bridger-Teton National Forest in western
Wyoming.

Western pine beetle Dendroctonus brevicomis

Location: Idaho
Host: Ponderosa pine

Western pine beetle activity remained static in southern Idaho with 4,900 trees killed in 1997
compared to 4,300 trees in 1996. Mortality was located on the Boise, Payette, and Sawtooth

National Forests. Pine engraver beetle activity was frequently associated with western pine
beetle infestation.

Others

Bracken Fern Sawfly Strongylogaster sp.

Location: Idaho
Host: Bracken fern

This sawfly which pupates in ponderosa pine and feeds on Bracken fern was found boring into
ponderosa pine bark in the Scriver Creek drainage near Crouch, Idaho.

Sequoia pitch moth Synanthedon sequoiae

Location: Nevada
Host: Lodgepole, Ponderosa pine

Localized populations are found on the east side of the Sierras, on the Toiyabe National Forest.
Some activity has been observed, affecting ornamental Jeffrey pine in Carson City, Nevada.

Status of Insect Conditions
Non-native

European gypsy moth Lymantria dispar

Location: Idaho, Nevada, Utah
Host: Various deciduous species

The gypsy moth was first detected in Utah in 1988. Between 1989 and 1993 approximately
72,000 acres of Federal, State, and private lands were treated with Bacillus thuringiensis (Bt). In
1995, after two years of intensive trapping resulting in no moth captures, the gypsy moth was
declared eradicated.

In 1997, 46 moths were captured in Salt Lake City and one moth on the Wasatch-Cache National
Forest. The moths are thought to have been reintroduced by the movement of household goods
from an infested area as opposed to being a residual population. The Utah Department of
Agriculture, in cooperation with the USDA Forest Service and other agencies, propose treatment
of 801 acres of private lands and 115 acres of Federal lands in 1998. An integrated pest
management approach will be used for eradication including treatment with Bt, mass trapping,
and suasanitiies if necessary.

Larch casebearer Coleophora laricella

Location: Idaho
Host: Western larch

Western larch on the Payette National Forest were defoliated by the larvae of this exotic moth.
Defoliation also occurred in residential areas of McCall and Cascade, Idaho.
Satin moth Leucoma salicis

Location: Idaho
Host: Willow

Heavy defoliation of willow caused by the larvae of the satin moth was detected near Donnelly,
Idaho.

Poplar-and-willow borer Cryptorhynchus lapathi

Location: Idaho
Host: Willow

The larvae of this weevil are defoliating and causing stem mortality of Scouler willow on the
west side of the Grand Teton Range in extreme southeastern Idaho.

Status of Stem and Branch Diseases
Native

Aspen trunk rot Phellinus tremulae

Location: Idaho, Nevada, Utah, Wyoming
Host: Aspen

Decay occurs in most aspen stands in the Region and is increasingly common as aspen stands
exceed 80 years of age.

Comandra blister rust Cronartium comandrae

Location: Idaho, Utah, Wyoming, Nevada
Host: Lodgepole, Ponderosa pine

Infection occurs infrequently throughout Idaho and Wyoming. Heavy, localized areas of
infection resulting in branch, top, and entire tree mortality of sapling size ponderosa pines occurs
in southern Idaho. In Wyoming and northern Utah, infection frequently occurs on lodgepole
pine in localized pockets.

Cytospora canker of true firs Cytospora abietis

Location: Idaho, Utah, Nevada, Wyoming
Host: True firs

Branch flagging, top-killing, and mortality attributed to this fungus occurs wherever host is
found. This disease is associated with environmental stress damage, drought, frost, and freezing.
Western balsam bark beetle frequently kills the diseased trees.

Dwarf mistletoes Arceuthobium spp

Location: Idaho, Nevada, Utah, Wyoming
Host: Douglas-fir, Pines, Western Larch

Suppression projects continue to remove infected overstory trees; however, this forest disease
remains the most widespread and frequently observed disease within the Intermountain Region.
Regional incidence by major host species is estimated as follows: lodgepole pine 50 percent,
ponderosa pine 20 percent, and Douglas-fir 20 percent infected. These numbers represent the
percentage of host stands having some level of infection.

Limb rust Peridermium filamentosum

Location: Utah
Host: Ponderosa pine

Infection causing branch mortality and occasional tree mortality occurs in all size classes of trees

on the Dixie National Forest in southern Utah.

Pinyon blister rust Cronartium occidentale
Location: Idaho, Utah
Host: Pinyon pine

This disease occurs in the Raft River Mountains on the Sawtooth National Forest, Idaho.

Red ring rot Phellinus pini

Location: Idaho, Nevada, Utah, Wyoming
Host: Douglas-fir, Pines, Spruce, Western Larch

Infection intensity varies throughout stands in the Region.

Rust-red stringy rot Echinodontium tinctorium

Location: Idaho, Nevada, Utah
Host: Grand fir, Subalpine fir, White fir

Decay caused by this fungus is common in mature and over mature stands of true firs.

Stalactiform blister rust Cronartium coleosporiodes

Location: Idaho, Nevada, Utah
Host: Lodgepole pine

This rust occurs in localized areas throughout the host type. Heavy infection has been noted in
very localized areas on the Boise, Payette, Sawtooth, and Challis National Forests in Idaho.
True mistletoe on juniper Phoradendron juniperinum

Location: Nevada, Utah
Host: Junipers

Occurring throughout the pinyon-juniper forest type in Utah and Nevada, this disease spreads
and intensifies slowly and is therefore more common in older stands.
Western gall rust Endocronartium harknessii

Location: Idaho, Utah, Wyoming
Host: Lodgepole, Ponderosa pine

Gall rust occurs throughout the host types. Infection levels vary, with localized heavy infection
present in both host species.
Other stem decays: Cryptoporus volvatus, Fomitopsis officinalis, Laetiporus sulphureus

Location: Idaho, Nevada, Utah, Wyoming
Host: Various conifers

A large number of minor stem decay agents, too numerous to list, occur with varying intensity
throughout the Region.

Status of Root Diseases
_ Native

Annosus root disease Heterobasidion annosum

Location: California, Idaho, Nevada, Utah, Wyoming
Host: Bitterbrush, Chokecherry, Douglas-fir, Jeffrey pine, Lodgepole pine, Ponderosa pine, :
Spruce, True firs

This root disease fungus can be found throughout the Region, but mostly as a decay organism.

The fungus is occasionally damaging to young, planted stands of ponderosa pine on droughty
soils.

Armillaria root disease Armillaria spp.

Location: Idaho, Nevada, Utah, Wyoming
Host: Douglas-fir, Grand fir, Pines, Spruce, Subalpine fir

Evidence of armillaria root disease can be found throughout the Region functioning primarily as

a weak pathogen or saprophyte causing little direct mortality. In southern Utah, it may act as a
primary pathogen, killing mature and immature ponderosa pine and mature fir and spruce.

Black stain root disease Ophiostoma wageneri

Location: Idaho, Nevada, Utah
Host: Pinyon pine

This fungus causes mortality of pinyon pine on the Bureau of Land Management Burley District
in Idaho, on the Humboldt and Toiyabe National Forests in Nevada, and on the Dixie and Manti-
LaSal National Forests in Utah.

Schweinitzii butt rot Phaeolus schweinitzii

Location: Idaho
Host: Douglas-fir, Spruce, Ponderosa pine

Decay is common in mature and over mature forests throughout the host type, especially those

with a frequent fire or logging history. The fungus is often associated with other root pathogens
and bark beetle activity. Trees are seldom killed directly as a result of infection.

Tomentosus root disease /nonotus tomentosus

Location: Idaho, Utah
Host: Douglas-fir, Spruce, Subalpine fir

This fungus is found alone or associated with Phaeolus schweinitzii and Armillaria spp. It

causes root and butt rot of pole sized and larger trees, predisposing them to bark beetle attack and
windthrow. In southern Utah, it kills spruce in progressively enlarging disease centers.

White mottled rot Ganoderma applanatum

Location: Idaho, Nevada, Utah, Wyoming
Host: Aspen

This pathogen is increasing in incidence throughout the Region. The disease can be found on

windthrown aspen on the Dixie, Wasatch-Cache, and Fishlake National Forests in Utah;
Humboldt National Forest in Nevada; and Caribou and Sawtooth National Forest in Idaho.

Status of Foliage Diseases
Native

Conifer - Aspen rust, Conifer - Cottonwood rust Melampsora medusae, Melampsora
occidentalis

Location: Idaho
Host: Aspen, Conifers, Cottonwood

Endemic throughout the host range of all Populus species. The fungus has not been observed
recently on the main conifer host, Douglas-fir, so it may be overwintering on Populus due to
mild winters.

Douglas-fir needle cast Rhabdocline spp.

Location: Idaho, Wyoming
Host: Douglas-fir

Incidence was light with infection noted throughout the range of Douglas-fir in southwestern
Idaho.
Elytroderma disease E/ytroderma deformans

Location: Idaho
Host: Ponderosa pine

Systemic and annual infections occur throughout the host type.

Fir broom rust Melampsorella caryophyllacearum

Location: Idaho, Nevada, Utah, Wyoming
Host: Subalpine fir

Infections occur throughout the host’s range. Infection intensity varies significantly, but is
common in stands south of the Snake River in Idaho.
Fir needle cast Lirula spp.

Location: Idaho
Host: Grand fir, Subalpine fir

Infection is at endemic levels throughout the host type.

Fir needle rust Pucciniastrum epilobii

Location: Idaho, Wyoming
Host: Subalpine fir

Scattered infection occurs on seedling and sapling size trees throughout the host type.

Incense cedar broom rust Gymnosporangium libocedri

Location: California, Nevada
Host: Incense cedar

This disease occurs in isolated patches of host trees on the Toiyabe National Forest.

Larch needle diseases Meria laricis, Hypodermella laricis

Location: Idaho
Host: Western larch

Incidence and severity of infection in west central Idaho is cyclical. In 1997, these diseases were
overshadowed by larch defoliation caused by the larch casebearer.

Lodgepole pine needle cast Lophodermella concolor

Location: Idaho
Host: Lodgepole pine

Infection intensity is worse following periods of drought. During intervening years, the disease
is of minor localized importance.
Marssonina blight Marssonina populi

Location: Idaho, Utah, Wyoming
Host: Aspen

The disease was epidemic in 1997 in central and eastern Idaho, northern Utah, and western
Wyoming. Affected trees had brown colored foliage from mid-July until leaf drop.

Pine needle rust Colesporium spp.

Location: Idaho
Host: Lodgepole, Ponderosa pine

Scattered incidence of light to moderate intensity occurred throughout the host types in southern
Idaho.

Spruce broom rust Chrysomyxa arctostaphylii

Location: Idaho, Utah, Nevada, Wyoming
Host: Englemann spruce

Scattered infections occurred throughout the host type, especially in eastern Idaho and in
localized pockets on the Fishlake National Forest, Utah.

Status of Stem and Branch Diseases
Non-native

White pine blister rust Cronartium ribicola

Location: Idaho, Nevada, Utah, Wyoming
Host: Limber, Whitebark, Sugar, Bristlecone, Western white pine

A formal survey of five-needled pines was conducted in 1995-1997 to quantify disease incidence
and intensity, and determine site and stand characteristics of infected areas. A final report is
forthcoming.

Declines/Complexes

Subalpine fir Mortality Complex
Dryocetes confusus, Pityophthorus sp., Pitvokeines sp., Crypturgus sp., Scolytus sp.,
Heterobasidion annosus, Armillaria sp., Cytospora abietis, Melampsporella caryophyllacearum

Location: Idaho, Utah, Wyoming
Host: Subalpine fir

Subalpine fir decline and mortality continues to occur throughout host type in the Region.
Ground examinations suggest a complex of factors are involved in this mortality. These factors
include: twig beetles, secondary bark beetles, wood borers, FS beetles, root diseases,
cankers, rusts, and environmental conditions.

In 1997 this complex resulted in the death of 133,300 trees throughout the Region compared to
121,200 in 1996. This mortality complex is the most widespread cause of visible mortality in the
Region.

Status of Nursery Insects and Diseases

Fusarium root disease Fusarium oxysporum

Location: Idaho, Utah
Host: Douglas-fir, Ponderosa pine, Spruce, True firs

This disease causes low levels of mortality primarily of 1-0 conifer seedlings at the Lucky Peak
Nursery, Boise National Forest, Idaho and the Lone Peak Nursery in Utah.
Phytophthora/Pythium root rot Phytophthora spp., Pythium spp.

Location: Idaho, Utah
Host: Douglas-fir, Spruce

These fungi occur infrequently on seedlings and in soil at the Lucky Peak Nursery, Boise

National Forest, Idaho, and the Lone Peak Nursery in Utah. Infection results in patch mortality
and culling of 2-0 seedlings

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SPECIAL PROJECT UPDATE

Fire Survival Plots Fire survival plots were installed in 1995 in six areas burned during
1994 wildfires on the Payette National Forest. These areas were selected because they
represented underburn conditions in Douglas-fir, grand fir, and subalpine fir habitat
types. The objective of this study is to develop criteria which would accurately classify
trees expected to die as a result of fire injury. These plots were again monitored in 1997.
Contact: Julie Weatherby

Permanent Plots to Validate Forest Disease Models This is an ongoing project to
establish permanent plots to aid in the validation of disease models including the dwarf
mistletoe model, the western root disease model, as well as models for comandra blister
rust and limb rust. These plots were installed in forests containing ponderosa pine,
lodgepole pine, and Douglas-fir dwarf mistletoes. Contact: John Guyon.

Thinning Second Growth Ponderosa Pine as a Management Strategy for Western
Pine Beetle Evaluation of an investigation on the Idaho City Ranger District, Boise
National Forest, continues to determine if differences exist in tree mortality among stands
of second growth ponderosa pine thinned to two different densities and an unthinned
check stand in the presence of western pine beetle infestation. Plots were monitored in
1997. Contact: Ralph Thier

White Pine Blister Rust Survey of the Intermountain Region A three year study was
completed in 1997 to investigate the current distribution of white pine blister rust in the
Intermountain Region. Whitebark, limber and bristlecone pines are hosts to the disease.
Overall blisterrust is widespread in southern Idaho and western Wyoming. It was not
found in northern Nevada or northern Utah. A final report is being prepared. Contact: J.
Smith, Jim Hoffman

Rush Skeltonweed Research This multi-year project involves a collaborative partnership
with Forest Health Protection and Forest Service Research, along with several other
federal and state agencies, universities, and private individuals to increase the
effectiveness of biological controls for rush skeltonweed. Priorities for 1998 include: a
continued search for potential pathogens and insect biological control agents in
Uzbekistan and the Republic of Georgia; and testing the many rust pathogens currently
known on North American varieties of skeltonweed at the Agriculture Research Service
laboratory in Montpellier, France. A colony of the root feeding moth Bradyyrrhoa
gilveolla has been established in the Montana State University quarantine in Bozeman,
MT. The insect is undergoing final host testing on native species of North American
asteraceae. Contact: Tom Barbouletos

Biological Control for Noxious Weed Management Theses projects involve coordination
with federal agencies, multi-state agencies, counties, universities, and private individuals
in collecting and exchanging biological agents to conduct operational and insectary
releases for the management of noxious weeds. Information, new technologies, and

educational materials are developed and shared in a collaborative stewardship approach
to this growing problem. Contact: Tom Barbouletos

Leafy Spurge Special Technology Development Project The project continued this year, with
most of the 22,000 acres of leafy spurge having been mapped and the individual site
characteristics delineated. Objectives for this year include completing the mapping and
site characteristic delineation, monitoring of agent populations, and vegetative sampling
to determine impacts of the released agents on the leafy spurge. A final report is due this
fall. Contact: Tom Barbouletos

Non-Target Surveys This project is a cooperative effort between FHP and Carnegie Museum of
Natural History. The objective of the two year survey (1997 & 1998) is to document the
biodiversity of selected non-target arthropods likely to have been or could be affected by
spraying of microbial insecticides during eradication of the gypsy moth along the
Wasatch Front of northern Utah. Non-target arthropod biodiversity will be compared
between sites treated and those not treated with Bacillus thuringiensis. Also, a number of
habitats are being sampled to obtain a comprehensive background of macrolepidoptera
along the Wasatch Front. Contact: John Anhold

Tools and Information for Predicting and Monitoring Spruce Beetle Populations
Four plots were established on the Wasatch-Cache and Dixie National Forests to identify
key temperature regimes which have an effect on life cycle duration and success of
spruce beetle populations in northern and southern Utah. These measurements will assist
in developing a model to predict population increases/decreases. Similar techniques and
model prototypes have been developed for mountain pine beetle. Statistical analysis of
1997 data will be used to correlate temperature regimes to duration of generation times.
Results from 1997 on factors influencing hibernation are inconclusive. Temperature
probes and hibernation emergence will be monitored in 1998. Contact: Steve Munson

Factors Influencing Spruce Beetle Population Dynamics and Silvicultural Implications for
Spruce Beetle Management Study sites were established on theManti-LaSal National
Forest to monitor seasonal availability of downed host material. The objective is to
determine whether spruce beetle colonization, brood production, and larval survival differ
with respect to the time of year downed host material is produced. Study pairs of
Englemann spruce were selected and dropped, one in the fall of 1996 and the other in the
spring of 1997 before beetle flight. All trees were visited in late July-August of 1997 to
record attacks on each host. In the spring of 1998 trees will be sampled to quantify the
number of emerging adults. Another study has been established on the Fishlake National
Forest to examine the effects of varying stand densities on spruce susceptibility. Three
stand treatments at various basal areas will be monitored to determine spruce beetle
impacts. Contact: Steve Munson

RECENT PUBLICATIONS

Anhold, J., D. Hansen, A. Dymerski. 1997. A follow-up survey of bark beetle activity within
the Blue Springs/Reed Valley Analysis Area. Dixie National Forest, Cedar City Ranger
District. FHP Report R4-97-02. USDA Forest Service. Intermountain Region, 8p.

Gardner, B., D. Halsey, and P. Mocettini. 1997. Forest Insect and Disease Conditions in the
Intermountain Region, 1996. Ogden, UT. USDA Forest Service, Intermountain Region,
2D):

Guyon, J. 1997. Root disease conditions in the Dark Valey and Purple Lake area, Teasdale
Ranger District, Dixie National Forest, FHP Report, R4-97-05, 23 p.

Hanson, D. 1997. Insect and Disease Conditions in Bryce Canyon National Park Detected
during August 1995. FHP Report R4-97-06. Ogden, Ut, USDA Forest Service,
Intermountain Region. 44 p.

Knapp, A., and M. Hoppus. 1996. Evaluation of a color infrared digital camera system for
forest health protection applications. /n: proceedings, Sixth Forest Service Remote
Sensing Applications Conference, Denver CO, p. 448.

Knapp, A., A. Disperati, and M. Hoppus. 1997. Evaluation of a color infrared digital
camera system for forest health protection applications in the western United States and
southern Brazil. /n: proceedings, First North American symposium on small format
aerial photography, Clouquet, MN, p. 217.

Knapp, A., and J. Zhou, 1997. Evaluation of a color infrared digital
camera system for forest health protection applications in Anhui Province, China, /n:
proceedings, International symposium on advanced technology in natural resource
management, Beijing, China.

Orland, B., and S. Munson. 1997. Implementing Data Visualization in Intergrated Forest
Planning. Contact No. AG 53-84M8-4-0028, Ogden, UT p.58.

Weatherby, J., J. Roberts, S. Donnelly, K. Ogle, and G. Jacobsen, 1997 Simulated
successional pathways for a a representative grand fir habitat on the Payette National
Forest. FHP Report R4-97-04. Ogden, UT. USDA. Forest Service, Intermountain
Region, 34 p.

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APPENDIX A

TABLE 1 Number of acres aerially surveyed by administrative area during 1997.

OWNERSHIP ACRES FLOWN
Boise NF 1,992,400
Ashley NF 921,900
Bureau of Land Management 936,200
Bridger-TetonNF 2,400,900
Caribou NF 1,009,200
Challis NF 632,400
Bureau of Reclamation 50,500
Dixie NF 1,410,300
Fishlake NF 1,105,400
Fort Hall Indian Reservation 60,300
Bryce Canyon National Park 29,800
State and Private Lands, Idaho 1,806,900
State and Private Lands, Nevada 82,500
Manti-LaSal NF 1,215,600
Cedar Breaks NM 6,000
- Payette NF 1,495,800
Salmon NF 1,187,200
Sawtooth NF 1,511,600
Targhee NF 953,624
Toiyabe NF 136,634
Uinta NF 732,200
State and Private Lands, Utah 1,738,100
Wasatch-Cache NF 940,900
State and Private Lands, Wyoming 192,300
Glen Canyon NP 45,000
1997 Total 22,593,658

A YRIMISAA
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TABLE 2 Status of mountain pine beetle infestations by state during 1997.

National Forest BES 3:5
Other Federal 0.0 0.0
State and Private 0.0
Total
(Grandiotal, eee ST tee 35.0)

TABLE 3 Status of spruce beetle infestations by state during 1997. .

Class Thousand Acres Thousands
Ly es Oe redraw PS eb oop} 00
nine | Statdand Private 9 slavniieeompt yk
}Woalio Total Feb OBE. tet Fediat

Se ee 1 ee eae
Utah Total Eee aaa
Grand Total eS 1 Eee eee

TABLE 4 Status of Douglas-fir beetle infestations by state during 1997.

Land Ownership Outbreak Area Number of Trees
Class | Thousand Acres Thousands
5.4

Cay

heats Otter Federal enn | eae 066"
[bE | Siaterand Private) | ae Osis OP 0.6

[Oa esr [iStateand Privates. s/n 2s

| WeakiMotal 2 | Na | ee aa ato 4.25
Wyoming National Forest ),9
Other Federal 0.0 0
es State and Private 0.0 0.0
es 2 eee
Total
| Grand Total >) | Rw 205 ee e203 | eeNeL
TABLE 5 Status of western pine beetle/Ips beetle infestations by state during 1997.
Class Thousand Acres Thousands

es | Gntienircaeral
[Pitts [Statesand Private a | ARNIS EEN T0.9))
Idaho Total es AI)

Grand Total Pi eee Ee

TABLE 6 Status of Jeffrey pine beetle infestations by state during 1997.

TABLE 7 Status of subalpine fir mortality complex by state during 1997.

Class Thousand Acres Thousands
co eee (Other Redcrale | ea
ie i Stateand envate | Pe 8 241 sn 0S:
Tdahooal eee eee (Ph 428 80S |
a Oticc kee |e Oi |
eS | iSiaigant crivstcus | SO 9 9.2)| oe 0.0 |
Utah ota] apes | meee ess | PO 0 16.8:| a 83.2.

National Forest 56.3 43.1
Other Federal 1.4 22
State and Private 1.4 0.9
bras 0
Total

Grand Total eS Geerieste: 128.7 158.7

TABLE 8 Status of fir engraver beetle infestations by: state during 1997.

Class Thousand Acres Thousands
| Tdaho =) es 2S National Forest ie | Rane 21] a Se ena:
Bae nc eo | RE OD
ae ee State and iPrivate AS | Sa 00)
Idaho Total. oo | ae ee | a 02) aS
aT ee a Other cderal ae | We) | ee nL
Ray Sy a State tind RAvatene | Me | os
‘Utah Total... 5) [2 Sh ge eat Peano SiG} Miao 20215)

National Forest 1.7 1.8
Other Federal . : 3 :
State and Private
menial ar | coro
Total

[Grand Total ea ae

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Appendix B

wuoMpng sonidg Wi9}sa\\

ap190q suid ureyunow

4,500,000 +
4,000,000 -
3,500,000 -
3,000,000 -
2,500,000
2,000,000 -
1,500,000 -
1,000,000 -

500,000 -

1980

Trees Killed by Bark Beetles

in the Intermountain Region 1980-1997

\ Ch
$e aa
B rs
2 yf
in SS

be -4—fe— =
1984 1986 1988 1990

1982

Figure |

- 400,000

L 300,000

}
+ 200,000

+ Douglas-fir beetle

3,250,000 -

3,000,000 —
2,750,000 -

spruce beetle

4% subalpine fir mortality complex

Acres Defoliated by

Figure 2

Western Spruce Budworm and Douglas-fir
Tussock moth in the Intermountain Region

1980-1997

all other bark beetles

- 500,000

q
L 400,000

2,500,000 —
2,250,000 -

2,000,000 —
1,750,000 -
1,500,000 -
1,250,000 -
1,000,000 -

750,000

500,000 -

250,000 ~

las

1992

+ Douglas-fir Tussock Moth -6 Western Spruce Budworm

Py ry ia
Z Ww 4

r
f

_ 300,000
| 200,000

y 100,000

Douglas-fir Tussock Moth

onigi I

Gofiae . a
: + OM,0
a | ; A rr
—_ OOc.e
Ori QE « (rg ( i Rais
eee | “3 fi; ik , Debane 8
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mye ORY | , ‘| . P
CAI WANS i * a * vi Lu { 060,.NG,S

+ ibs F fax 4 al ThA
. i ie / ; rey we
we tad <« ows Maa:
e “oP : a Gt ake
: aM a by ts \
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i?
»
@
G
‘
Sf
i
=~...

Mawr. ~ yo Nl
“oe 2 j

SE { ret Cee peel aa¢’ say PAL ST GRO. OST!
wd Avep ys (@ Bleed Ansa enw SSS) BRAD : PAP oe
) veep? YR Wer aleaue. ee te — oer i |

nae iaive W

ahha tt haa snte wh | ‘
) ASeeanT

noigaH cicero

enRjee er | meerK preys

FIGURE 3. Tree mortality associated with mountain pine beetle, Jeffrey
pine beetle, and round headed beetle in Region 4 - 1997
aerial detection surveys.

SCALE 1:6000000

O 25 50 75 100
SS Ee

MILES

Bridger-Teton

National
Forest

NATIONAL

FORESTS
of the

INTERMOUNTAIN
REGION

Insect Activity

Area Surveyed

SOOOOGeh St
oor a G8 Bo

hae ake, Oe

FIGURE 4. Tree mortality associated with spruce beetle in Region 4 - 1997
aerial detection surveys.

SCALE 1:6000000

MILES

Bridger-Teton

NATIONAL

FORESTS
of the

INTERMOUNTAIN
REGION

Insect Activity

Area Surveyed

FIGURE5. Tree mortality associated with Douglas-fir beetle and Douglas-fir
pole beetle in Region 4 - 1997 aerial detection surveys.

\ Salmon-Challie
% National
Forest

SCALE 1:6000000

0 25 50 75 100
a (_———

MILES

Bridger-Teton
National
Forest

Sawtooth
National Forest

Humboldt

C]Natonal

Forest

NATIONAL

FORESTS

i of the
Insect Activity

seasueyes INTERMOUNTAIN
REGION

FIGURE 6. Tree mortality associated with western pine beetle and Ips beetle
in Region 4 - 1997 aerial detection surveys.

SCALE 1:6000000

092555505575 5100
Se ee

MILES

NATIONAL

FORESTS
of the

INTERMOUNTAIN
REGION

Insect Activity

Area Surveyed

DeO00e t LuAaE

bor at OF Sr >

ay aed as
oi

FIGURE7. Tree mortality associated with fir engraver beetle and subalpine
fir mortality complex in Region 4 - 1997 aerial detection surveys.

\ Salmon-Challis

SCALE 1:6000000

O 25 50 75 100
E SSS

MILES

Bridger-Teton
National

Sawtooth
National Forest

National
Forest

National L Q a
Humboldt G

Forest

NATIONAL

FORESTS
of the

INTERMOUNTAIN
REGION

Insect Activity

Area Surveyed

‘? ; 4p fin Ds
WE hae
a4 ty (ah et
LAR

,
Witty

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