Orgyia pseudotsugata egg masses being tied to branches of fir trees. These egg masses were used as traps for Douglas-fir tussock moth egg parasite work. Predator information was also obtained. T.R. Torgersen in photograph.

Photo by: H.G. Paul
Date: November 1978

Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.
Collection: Portland Station Collection; La Grande, Oregon.
Image: PS-4443

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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