Controlled field test of stabilized pyrethrins against the western hemlock looper
By: by Richard R. Mason.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: USDA Forest Service research note PNW -- 120.
Publisher: Forest Service of the U.S. Department of Agriculture]
Published: 1970
Place of publication: [Portland, Or
Language: eng
Subjects: Pyrethrins -- Biodegradation -- Washington (State) -- Mount Baker National Forest.; Hemlock looper -- Effect of chemicals on -- Washington (State) -- Mount Baker National Forest.
Notes: Cover title.

"May 1970."