Sampling Western Spruce Budworm larvae by frequency of occurrence on lower crown branches
By: R.R. Mason and R.C. Beckwith.
Contributors: Beckwith, R. C.; Pacific Northwest Research Station (Portland, Or.)
Series: Research note PNW -- 497.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
Published: 1990
Place of publication: [Portland, Or. (319 S.W. Pine St., P.O. Box 3890, Portland 97208)]
Language: eng
Number of pages: 11
Subjects: Western spruce budworm -- Oregon -- Statistics.; Spruce -- Diseases and pests -- Oregon -- Statistics.; Sampling (Statistics)
Notes: Caption title.

Distributed to depository libraries in microfiche.

"November 1990."

Includes bibliographical references (p. 10-11).