How to protect individual trees from western spruce budworm by implants and injections /
Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service,
|Subjects:||WESTERN SPRUCE BUDWORM-CONTROL-UNITED STATES, PESTICIDES-APPLICATION, AERIAL SPRAYING AND DUSTING IN FORESTRY-UNITED STATES, United States. Forest Service, United States. Cooperative State Research Service, Canada/United States Spruce Budworms Program,|
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