Spray helicopter. Douglas-fir tussock moth control project.
Photo by: Dave McComb
Date: 1974
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Source: Forest Health Protection slide collection; Regional Office, Portland, Oregon.
For more information about this project see:
Graham, D.A.; J. Mounts; D. Almas. 1975. 1974 Cooperative Douglas-fir tussock moth control project: Oregon, Washington, Idaho. Portland, OR: USDA Forest Service, Pacific Northwest Region. 74 p.
Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth
