Biology and control of douglas-fir needle midges in Christmas tree plantations
By: [prepared by Arthur L. Antonelli].
Contributors: Washington State University. Cooperative Extension.; United States. Dept. of Agriculture.
Series: Insect answers; EB -- 1014.; Extension bulletin (Washington State University. Cooperative Extension) -- 1014.
Publisher: Cooperative Extension, College of Agriculture, Washington State University
Published: 1981
Place of publication: Pullman, Wash
Language: eng
Subjects: Douglas fir -- Diseases and pests; Gall midges -- Control; Christmas tree industry -- Economic aspects
Notes: Caption title.

"December 1981"--P. [1].

"Revised from and replaces EM 4257"--P. [2].