Samples of each DDT batch are checked at the lab. Spray headquarters main mixing plant. Walla Walla, Washington.
OR/WA/ID Douglas-fir tussock moth control project.
See also:
www.flickr.com/photos/151887236@N05/40951908820/in/datepo... Photo by: Unknown
Date: June/July 1974
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Source: Division of Timber Management, Insect and Disease Control print 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.
babel.hathitrust.org/cgi/pt?id=umn.31951d01325807f;view=1... Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth
