File:1934. Class 3A in Keen's ponderosa pine tree classification, used for comparison of bark beetle susceptibility classes based on age and vigor. (38221464181).jpg
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Class 3A in Keen's ponderosa pine tree classification, used for comparison of bark beetle susceptibility classes based on age and vigor. Photo by: F.P. Keen Date: September 1934 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology Collection; La Grande, Oregon. Image: BUR-8710 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 Keen's classifications see: <a href="https://www.fs.fed.us/psw/publications/ecology_of.../psw_1943_keen001.pdf" rel="nofollow">www.fs.fed.us/psw/publications/ecology_of.../psw_1943_kee...</a> For additional historical forest entomology photos, stories, and resources see the Western Forest Insect Work Conference site: <a href="http://wfiwc.org/content/history-and-resources" rel="nofollow">wfiwc.org/content/history-and-resources</a> Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: <a href="https://www.fs.usda.gov/main/r6/forest-grasslandhealth" rel="nofollow">www.fs.usda.gov/main/r6/forest-grasslandhealth</a> |
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| Source | 1934. Class 3A in Keen's ponderosa pine tree classification, used for comparison of bark beetle susceptibility classes based on age and vigor. |
| Author | R6, State & Private Forestry, Forest Health Protection |
Licensing
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This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
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This image was originally posted to Flickr by USDA Forest Service at https://flickr.com/photos/151887236@N05/38221464181 (archive). It was reviewed on 8 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark. |
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This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
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| current | 19:41, 8 May 2018 | | 884 × 1,319 (266 KB) | OceanAtoll (talk | contribs) | Transferred from Flickr via #flickr2commons |
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