Observations on the impact of western spruce budworm on the Nezperce National Forest, Idaho, 1972
By: by W.M. Ciesla, R.C. Lood, and W.E. Bousfield.
Contributors: Lood, Rudolph C.; Bousfield, Wayne E.; United States. Forest Service. Northern Region. State & Private Forestry.
Series: Report -- no. 73-13.; Report (United States. Forest Service. Northern Region) -- no. 73-13.
Publisher: USDA, Forest Service, Northern Region, Division of State and Private Forestry
Published: 1973
Place of publication: Missoula, Mont
Language: eng
Subjects: Western spruce budworm -- Idaho -- Nezperce National Forest.; Conifers -- Diseases and pests -- Idaho -- Nezperce National Forest.; Defoliation -- Idaho -- Nezperce National Forest.
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.
Notes: Caption title.

Includes bibliographical references (leaf 7).

Also issued online.