1953. Windthrow used for D. pseudotsugae population studies. Heavy Poria weirii infection in root over James Trappe's head. Packwood, Washington.

Windthrow used for D. pseudotsugae population studies. Note heavy Poria weirii infection in root system. Root over James Trappe's head is the only one supplying support and nutrients to the tree. Packwood Lake Trail. Packwood, Washington.

 

Photo by: Ken H. Wright and James Trappe.

Date: June 3, 1953

 

Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.

Collection: Portland Station Collection; La Grande, Oregon.

Image: PS-1123

 

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 Western International Forest Disease Work Conference information see: www.wifdwc.org/

 

Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth

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