Recent (1977-1980) releases of imported larch casebearer parasites for biological control
By: Roger B. Ryan.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: Research note PNW -- 377.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Published: 1981
Place of publication: [Portland, Or.?]
Language: eng
Subjects: Larch casebearer -- Biological control
Notes: Caption title.

Bibliography: p. 5-6.