Effects of the balsam woolly aphid (Adelges piceae (Ratzburg)) on the cambial activity of grand fir (Abies grandis (Dougl.) Lindl.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.)
By: by Warren Elmer Sisson, Jr.
Published: 1971
Language: eng
Number of pages: 49
Subjects: Aphididae.; Fir -- Diseases and pests.
Notes: Typescript (photocopy).

Thesis (Ph. D.)--Oregon State University, 1971.

Includes bibliography.