Abies lasiocarpa killed by balsam woolly adelgid. Wind River Arboretum. Carson, Washington.
Photo by: R.E. Balch and N.B. Fredericton Date: July 1958
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection. Collection: Portland Station Collection; La Grande, Oregon. Image: PS-2997
For more, see The Balsam Woolly Aphid Problem in Oregon and Washington, Research Paper Number 18. 1957. Pacific Northwest Forest and Range Experiment Station. Portland, Oregon: www.fs.fed.us/pnw/pubs/pnw_os_rp-18.pdf