Some effects of predaceous birds and ants on the western spruce budworm on conifer seedlings
By: Robert W. Campbell ... [et al.].
Contributors: Campbell, Robert W.; Pacific Northwest Forest and Range Experiment Station (Portland, Or.); Canada/United States Spruce Budworms Program.
Series: Research paper PNW -- 315.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Published: 1984
Place of publication: [Portland, Or.]
Language: eng
Subjects: Western spruce budworm -- Biological control; Conifers -- Seeds
Notes: Cover title.

Distributed to depository libraries in microfiche.

"CANUSA, Canada United States Spruce Budworms Program."

"February 1984."

Bibliography: p. 5.