William M. Ciesla

Observations on the impact of western spruce budworm on the Nezperce National Forest, Idaho, 1972

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Author

William M. Ciesla

Contributions

Lood, Rudolph C. - Contributor
Bousfield, Wayne E. - Contributor
United States. Forest Service. Northern Region. State & Private Forestry. - Contributor

Publication

1973 - USDA, Forest Service, Northern Region, Division of State and Private Forestry, Missoula, Mont, Montana

Language

English

Word Count

0 words, Guess

Page Count

0 pages

Identifiers

Open LibraryOL16109456M

Classifications

LCCSB945.W539 C54 1973

Description

Aerial surveys of the Nezperce National Forest in Idaho revealed 138,692 acres of aerially visible top kill and tree mortality due to repeated defoliation by western spruce budworm, Choristoneura occidentalis Freeman. A small ground sample indicates that up to 47 percent of the grand fir volume was affected by top kill in some areas. True firs were most severely affected by repeated defoliation, and Engelmann spruce was intermediately affected. No top kill or tree mortality was observed on Douglas-fir.

Subjects

Topics

Conifers Defoliation Diseases and pests Western spruce budwormDefoliation -- Idaho -- Nezperce National ForestWestern spruce budworm -- Idaho -- Nezperce National ForestConifers -- Diseases and pests -- Idaho -- Nezperce National Forest

Places

Idaho Nezperce National Forest

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