Evacuation assembly and equipment used for 5-foot fumigation chambers. Note vacuum cleaner motor inserted into opening in chamber, and 12-foot extension pipe for dispersing gas into air. European pine shoot moth control.
Photo by: W.C. Guy and V.M. Carolin Date: March 1961
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Portland Station Collection; La Grande, Oregon. Image: PS-2692
To learn more about this photo collection see: Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of forest insect investigations on the Pacific Slope, 1903-1953. Part 2. Oregon and Washington. American Entomologist, 48(3), p. 178-185.
For more, see: Klein, W.H. and R.M. Thompson. 1962. Procedures and equipment for fumigating European pine shoot moth on ornamental pines. USDA Forest Service, Pacific Northwest Forest and Range Experiment Station. Portland, Oregon. 25 p. archive.org/details/proceduresequipm50klei