File:1935. Photos show Keen's ponderosa pine tree classification - for comparison of bark beetle susceptibility classes based on age and vigor. (34850358992).jpg
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[edit]Description1935. Photos show Keen's ponderosa pine tree classification - for comparison of bark beetle susceptibility classes based on age and vigor. (34850358992).jpg |
Photos show Keen's ponderosa pine tree classification - for comparison of bark beetle susceptibility classes based on age and vigor. For more, see: Miller, John Martin, and Frederick Paul Keen. Biology and control of the western pine beetle: a summary of the first fifty years of research. No. 800. US Department of Agriculture, 1960. <a href="https://archive.org/details/biologycontrolof800mill" rel="nofollow">archive.org/details/biologycontrolof800mill</a> 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> Photo by: Unknown Date: 1935 Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Portland Station Collection; La Grande, Oregon. Image: PS-282B 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 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> |
Date | |
Source | 1935. Photos show Keen's ponderosa pine tree classification - for comparison of bark beetle susceptibility classes based on age and vigor. |
Author | R6, State & Private Forestry, Forest Health Protection |
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[edit]Public domainPublic domainfalsefalse |
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, originally posted to Flickr, was reviewed on 31 December 2018 by the administrator or reviewer 1989, who confirmed that it was available on Flickr under the stated license on that date. |
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