1992 Umatilla and Wallowa-Whitman National Forests Western Spruce Budworm Suppression project. La Grande and Walla Walla Ranger Districts

46 Pages·1993·2.8 MB·English

by  Hadfield, James S

Historic, Archive Document
Do not assume content reflects current
scientific knowledge, policies, or practices.
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1992 UMATILLA AND WALLOWA- WHITMAN
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1993
WESTERN SPRUCE BUDWORM
SUPPRESSION PROJECT
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1992 UMATILLA AND WALLOWA-WHITMAN NATIONAL FORESTS
WESTERN SPRUCE BUDWORM SUPPRESSION PROJECT
LA GRANDE AND WALLA WALLA RANGER DISRICTS
JAMES S. HADFIELD
i INCIDENT COMMANDER
USDA FOREST SERVICE - FOREST PEST MANAGEMENT
PORTLAND, OREGON
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TABLE OF CONTENTS Page No.
Introduction
Objectives
Project Area
Project Organization
Contracting
Facilities and Equipment
Spray Operations
Entomology Operations
Spray Operations Accomplishments
Entomology Sampling Results
Budget
Safety
Discussion
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Appendix
Tables ID=12
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1992 UMATILLA AND WALLOWA-WHITMAN NATIONAL FORESTS
WESTERN SPRUCE BUDWORM SUPPRESSION PROJECT
LA GRANDE AND WALLA WALLA RANGER DISTRICTS
INTRODUCTION
Western spruce budworm (Choristoneura occidentalis Freeman) populations have been at outbreak
levels on portions of the Umatilla and Wallowa- Whitman National Forests in northeast Oregon since
the early 1980’s. Defoliation caused by the budworm outbreaks, in combination with impacts from
several other pests, severe drought, and other stress factors, has resulted in serious forest health
decline over hundreds of thousands of acres of forests in the Blue Mountains of northeast Oregon
and southeast Washington.
In 1990 and 1991, both National Forests established budworm analysis units to estimate budworm
population levels, and assess the effects of the outbreaks and management alternatives on resource
management. Biological evaluation of the budworm infestations in the analysis units done in
the summer of 1991 predicted that population densities in 1992 would be high enough to cause
moderate to severe defoliation (Scott, D.W., 1991 Biological evaluation of western spruce budworm
in 1992 analysis units on the Umatilla and Wallowa-Whitman National Forests. Rep. BMZ-91-04,
USDA-Forest Service, Wallowa-Whitman NF. La Grande, OR. 54 p.)
The two National Forests.prepared a site-specific Environmental Assessment, “Umatilla and Wallowa-
Whitman National Forests Western Spruce Budworm”. The alternative selected in the EA was to
suppress the budworm population on 185,373 acres in seven analysis units with the biological insec-
ticide Bacillus thuringiensis variety kurstaki (Btk). A Decision Notice and Finding of No Significant
Impact was signed by Forest Supervisors from both National Forests by December 3, 1991.
A decision was made to split the areas to be sprayed into two separately administered projects
because of the distance separating the treatment areas. The La Grande project included the analysis
units on the La Grande and Walla Walla Districts, the Enterprise project included analysis units on
the Wallowa Valley District. This report describes the objective, location, organization, procedures,
and results of the La Grande project. A separate report describes the Enterprise project.
OBJECTIVE
The objective of the suppression project was to safely, efficiently, and economically reduce the
western spruce budworm populations within the treatment areas to levels that would not cause
additional, unacceptable resource damage for several years. The suppression target goal for each
analysis unit was to reduce the budworm population by 90 percent, unadjusted for natural mortality,
in the time period from the prespray sampling to the postspray sampling.
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