Using horticultural spray oils to control orchard pests
By: M. Willett and P.H. Westigard.
Contributors: Westigard, Peter H.; Oregon State University. Extension Service.; Washington State University. Cooperative Extension.; University of Idaho. Cooperative Extension Service.; United States. Dept. of Agriculture.
Series: PNW -- 328.; PNW (Series) -- 328.
Publisher: Oregon State University Extension Service, Washington State University Cooperative Extension, University of Idaho Cooperative Extension Service, and U.S. Dept. of Agriculture
Published: 1988
Place of publication: Corvallis, Or
Language: eng
Subjects: Oil as pesticide
Notes: Title from caption.

"September 1988."