Mixed stand of subalpine and Pacific silver fir heavily damaged by balsam woolly adelgid. Most of the sub-alpine fir is dead. Ball-shaped crowns on silver fir are typical of damage to this species. Near Blair Meadows. Willamette National Forest, Oregon.
Photo by: Russ G. Mitchell
Date: August 1958
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.
Collection: Portland Station Collection; La Grande, Oregon.
Image: PS-2170
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 about the balsam woolly adelgid see: Ragenovich, I.R. and R.G. Mitchell. 2006. Balsam Woolly Adelgid. Forest Insect and Disease Leaflet 118. USDA Forest Service, available here:
www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_043667.pdf For additional historic forest entomology photos, stories, and resources see the Western Forest Insect Work Conference site:
wfiwc.org/content/history-and-resources Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth
