How to distinguish between old and new egg masses of the western spruce budworm.
Contributors: United States. Cooperative State Research Service.; Canada/United States Spruce Budworms Program.
Series: Spruce budworms handbook; Agriculture handbook -- no. 623.; Agriculture handbook (United States. Dept. of Agriculture) -- no. 623.
Publisher: U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service
Published: 1984
Place of publication: [Washington, D.C.?]
Language: eng
Subjects: Western spruce budworm.
Notes: "CANUSA, Canada United States Spruce Budworms Program"--P. 2.

"May 1984"--P. 2.

Bibliography: p. 7.