Additional releases of larch casebearer parasites for biological control in the western United States
By: R. B. Ryan ... [et al.].
Contributors: Ryan, Roger B.; Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: USDA Forest Service research note PNW -- 242.
Publisher: Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Published: 1975
Place of publication: Portland, Or
Language: eng
Subjects: Larch -- Diseases and pests -- West (U.S.); Larch case-bearer -- Biological control -- West (U.S.)
Notes: Bibliography: p. 7.