Benton Howard (left) and Warren V. Benedict looking at mountain pine beetle damage in lodgepole pine. Bald Mountain, Silver Lake Ranger District, Fremont National Forest, Oregon.
For more, see: Dolph, Robert E. 1968. Mountain pine beetle damage in the Pacific Northwest, 1955-1966. USDA Forest Service, Pacific Northwest Region, Division of Timber Management, Insect and Disease Control Branch. Portland, Oregon. 36 p.
Photo by: Robert E. Dolph Date: September 1966
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Division of Timber Management, Insect and Disease Control Branch Collection; Regional Office, Portland, Oregon. Image: ID-536