Ponderosa pine, Risk 1; California Pine Risk-Rating System. Tree number 127, Plot B 29-10. Blacks Mountain, California. Photo by: Bongberg Date: October 7, 1942 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology Collection; La Grande, Oregon. Image: BUR-11415-B 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...
Topics: susceptibility, usda, bureauofentomologyandplantquarantine, tree, pinusponderosa, Keen Ponderosa...