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Forestry
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Author
United States. Forest Service. Northern Region. State & Private Forestry
Remove constraint Author: United States. Forest Service. Northern Region. State & Private Forestry
Subject
Western spruce budworm -- Idaho
Remove constraint Subject: Western spruce budworm -- 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 egg masses for predicting defoliation potential in the northern region : progress report
An attempt was made to predict western spruce budworm defoliation using egg counts from plots in the Douglas-fir type east of the Continental Divide in Montana, the Douglas-fir type west of the Continental ...Citation -
5. [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