Ponderosa pine stump section showing tree growth rings and fire scars from 1255-1930. Deming Creek. Bly, Oregon.

Note: "For the long-period fluctuations, five areas were selected in widely separated sections of Eastern Oregon, where logging operations were in progress. These were the Clover Station area south of Beatty, the Horsefly Mountain area south of Bly, the Pringle Falls area west of La Pine, and the Watkins Butte area north of Fort Rock, Oregon. The first three areas in Klamath County were approximately 50 miles apart, while the last two areas in Deschutes County were over 100 miles north of these and 50 miles from each other. The differences in topography, forest type, site, and distance apart of these five areas served to eliminate the chance of any one factor other than climate affecting growth patterns in exactly the same manner in any given period of years.

From each area V-shaped radial sections were sawed from freshly cut stumps so as to include the center and the most uniform radius. From 30 to 90 stump sections were obtained from each area, so selected as to give a balanced overlapping of age classes."

From: Keen, F. P. 1937. Climatic cycles in eastern Oregon as indicated by tree rings. Monthly Weather Review. 65:175–188. See: <a href="http://www.fsl.orst.edu/rna/Documents/publications/Climatic cycles in Eastern Oregon as indicated by tree rings 1937.pdf" rel="nofollow">www.fsl.orst.edu/rna/Documents/publications/Climatic%20cy...</a>

Photo by: Walter J. Buckhorn Date: January 1937

Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Bureau of Entomology, Portland Station Collection; La Grande, Oregon. Image: PS-328

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>

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