USDA Forest Service:
1970. Spraying a freshly-cut western hemlock stump with Urea. Fomes annosus control study.
USDA Forest Service:
1970. Cutting a 4 inch diameter western hemlock for stump treatment. Fomes annosus control study.
USDA Forest Service:
1970. Innoculating a freshly-cut western hemlock stump with Fomes annosus fungal spore suspension. Fomes annosus control study.
USDA Forest Service:
1970. Collecting a sample from a western hemlock stump innoculated with Fomes annosus spores four months earlier. Fomes annosus control study.
USDA Forest Service:
1970. Ponderosa pine spore trapping disks. Fomes annosus control study.
USDA Forest Service:
1970. Tommy Gregg working with infrared transparencies on the mountain pine beetle project. La Grande Ranger District, Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Bob Dolph (left) and Tommy Gregg using infrared transparencies to see mountain pine beetle damage. Mountain pine beetle project. La Grande Ranger District, Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Bob Dolph (left) and Tommy Gregg using infrared film on the mountain pine beetle project. La Grande Ranger District, Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Bob Dolph (left) and Tommy Gregg using infrared film on the mountain pine beetle project. La Grande Ranger District, Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Ed Dierling working with a calculator to total data collected from color transparencies. Mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Forest entomologists Peter Orr (standing) and Bob Dolph working with the Old Delft stereoscope to scan color transparencies for the mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Leon F. Pettinger working on aerial forest insect and disease detection survey maps. USFS Regional Office, Portland, Oregon.
USDA Forest Service:
1970. Tommy Gregg reading Ektachrome infrared film. Mountain pine beetle in lodgepole pine project. La Grande Ranger District, Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. John Wear (standing) and Bob Dolph working with the Old Delft stereoscope to scan color transparencies for the mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Larry Bucklin working with the Old Delft stereoscope to scan color transparencies for the mountain pine beetle project on the Wallowa-Whitman National Forest.
USDA Forest Service:
1970. Larry Bucklin working with the Old Delft stereoscope to scan color transparencies for the mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Vern Creasap working on color transparencies. Mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
1970. Richard Hannan working with color transparencies. Mountain pine beetle project on the Wallowa-Whitman National Forest, Oregon.
USDA Forest Service:
c.1970. Tree planting. Siskiyou National Forest, Oregon.
USDA Forest Service:
c.1970. Rhizina undulata fr. Disease Cycle.
USDA Forest Service:
1971. Ponderosa pine with chemical damage due to excess phosphorus fertilizer.
USDA Forest Service:
1971. Ponderosa pine seedlings with chemical damage due to excess phosphorus fertilizer.
USDA Forest Service:
1971. Ponderosa pine seedling with chemical damage due to excess phosphorus fertilizer.
USDA Forest Service:
1969. Collecting aquatic life samples for water quality monitoring during a controlled field test of stabilized pyrethrins against the western hemlock looper. Mt. Baker National Forest, near Marblemount, Washington.
USDA Forest Service:
1967. Mountain pine beetle in ponderosa pine treated with Cacodylic Acid in June 1967. Old Camp Warner, Lakeview Ranger District, Fremont National Forest, Oregon.
USDA Forest Service:
1967. Mountain pine beetle in ponderosa pine treated with Cacodylic Acid in June 1967. Old Camp Warner, Lakeview Ranger District, Fremont National Forest, Oregon.
USDA Forest Service:
1967. Ponderosa pine treated with Cacodylic Acid in June 1967. Don Healy (summer assistant) pointing to a mountain pine beetle pitch tube. Old Camp Warner, Lakeview Ranger District, Fremont National Forest, Oregon.
USDA Forest Service:
1967. Mountain pine beetle in ponderosa pine treated with Cacodylic Acid in June 1967. Old Camp Warner, Lakeview Ranger District, Fremont National Forest, Oregon.
USDA Forest Service:
1967. Mountain pine beetle in ponderosa pine treated with Cacodylic Acid in June 1967. Old Camp Warner, Lakeview Ranger District, Fremont National Forest, Oregon.
USDA Forest Service:
1967. Salvage logging lodgepole pine killed by mountain pine beetle. Chemult Ranger District, Winema National Forest, Oregon.
