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Some observations on the impact of western spruce budworm on the Clearwater National Forest, Idaho Public Deposited

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https://ir.library.oregonstate.edu/concern/defaults/k06988969

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  • The current western spruce budworm, Choristoneura occidentalis Freeman, outbreak on the Clearwater National Forest was first detected in 1966. Since then, the infestation has increased to epidemic proportions with over 500,000 acres of State, Federal, and private forest land visibly defoliated. In addition, incipient budworm populations are present throughout much of the remaining fir type. The intensity of the defoliation has fluctuated from year to year and from one area to another; however, in some stands, the damage has been extreme for the duration of the epidemic. The total impact of the budworm outbreak on the forest environment is subject to speculation. No one can deny the esthetic impact when in late July and early August each year, vast acreages of fir and spruce type turn brown. Cone production is known to have been adversely affected. In areas of repeated defoliation, tree growth almost certainly has been reduced. While no extensive mortality has been observed, some top killing has occurred, primarily in sapling and pole-size trees. During the fall of 1971 and 1972, western spruce budworm impact surveys were initiated in four separate areas of infestation on the Clearwater National Forest.
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