Witches' broom caused by fir false mistletoe, Razoumofskya occidentalis abietina on lowland white fir at Sen. McNary's farm. Salem, Oregon.
Photo by: R.L. Furniss Date: September 20, 1937
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology Collection; La Grande, Oregon. Image: BUR-8904
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.