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Forestry
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Conifers -- Diseases and pests -- Idaho
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Western spruce budworm -- Montana
Remove constraint Subject: Western spruce budworm -- Montana
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3. [Article] Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977
Epidemic populations of the western spruce budworm persist in the Northern Region. Aerial surveys made in August 1976 showed a decline in the acreage of aerially visible defoliation. In northern Idaho, ...Citation -
4. [Article] Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979
Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased ...Citation