Sampling Western Spruce Budworm larvae by counting larvae on lower crown branches
By: R.R. Mason, B.E. Wickman, and H.G. Paul.
Contributors: Wickman, Boyd E.; Paul, H. G.; Pacific Northwest Research Station (Portland, Or.)
Series: Research note PNW -- RN-486.; Research note PNW -- 486.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
Published: 1989
Place of publication: [Portland, Or. (319 S.W. Pine St., P.O. Box 3890, Portland 97208)]
Language: eng
Subjects: Western spruce budworm -- Oregon -- Statistics.; Spruce -- Diseases and pests -- Oregon -- Statistics.; Sampling (Statistics)
Genres: Statistics.
Notes: Caption title.

"March 1989."

Includes bibliographical references (p. 8).