Sawfly defoliation of knobcone pine stand. Note undamaged ponderosa pine tree to the left of defoliated knobcone pine. Deer Creek Drainage, Diamond Lake Ranger District, Umpqua National Forest, Oregon.
Photo by: Robert E. Dolph
Date: July 23, 1963
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-125
Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth
