Douglas-fir needle midges
Subtitle: determining a spray schedule through use of the midge trap
By: prepared by Gary H. Sander in cooperation with the Department of Entomology, Oregon State University.
Contributors: Oregon State University. Cooperative Extension Service.; Oregon State University. Dept. of Entomology.
Series: FS -- 164.; Fact sheet (Oregon State University. Cooperative Extension Service) -- 164.
Publisher: Oregon State University, Cooperative Extension Service
Published: 1969
Place of publication: [Corvallis, OR]
Language: eng
Subjects: Douglas fir -- Diseases and pests -- Oregon, Western.; Contarinia -- Oregon, Western.
Notes: Caption title.

"April 1969."

Includes bibliographical references (p. [2]).