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Forestry
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Author
Flavell, Thomas H.
Remove constraint Author: Flavell, Thomas H.
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 -- Montana
Remove constraint Subject: Western spruce budworm -- Montana
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2. [Article] Potential for defoliation by western spruce budworm in Douglas-fir stands in Montana, 1976
Aerial surveys of six Montana National Forests in 1975 found a 22.1% increase in the area of visible defoliation caused by the western spruce budworm. It is estimated that 2,278,804 acres of Douglas-fir ...Citation