USDA Forest Service:
1955. Phytodietus fumiferanae. Larva of this external parasite shown in typical feeding position on the thorax of a 6th instar spruce budworm larva. Baker, Oregon.
USDA Forest Service:
1944. Spraying Douglas-fir and ponderosa pine for spruce budworm with DDT. Roosevelt National Forest, Colorado.
USDA Forest Service:
1948. Map of western spruce budworm aerial spray test plots. Heppner Ranger District, Umatilla National Forest. Oregon, Bureau of Entomology and Plant Quarantine, Division of Forest Insect Investigations.
USDA Forest Service:
1948. Western spruce budworm defoliation of Douglas-fir and white fir. Tupper area. Umatilla National Forest, Oregon.
USDA Forest Service:
1948. Mixing DDT spray in Central Aircraft's tank-mixing truck. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Walter J. Buckhorn shooting a line-gun to mark aerial spray block boundaries. Western spruce budworm control project. Kinzua, Oregon.
USDA Forest Service:
1948. Walter J. Buckhorn shooting a line-gun to mark aerial spray block boundaries. Western spruce budworm control project. Kinzua, Oregon.
USDA Forest Service:
1948. Travelaire 4000 airplane used on western spruce budworm control project. Pilots John Wear (left) and Olson. Kinzua area, Oregon.
USDA Forest Service:
1948. Central Aircraft's Travelaire 4000 discharging DDT spray over budworm-infested forest. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Central Aircraft's Travelaire 4000 discharging DDT spray over budworm-infested forest. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Central Aircraft's Travelaire 4000 discharging DDT spray over budworm-infested forest. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Walter J. Buckhorn (left) and Charles B. Eaton (right). Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Al Lindsten (left), Vern Montgomery, and John Woods, Jr. Spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Bell helicopter used on western spruce budworm control project. Pilots Vern Montgomery and Tommy Hall (left) and Al Lindsten (right) of the Oregon State Board of Forestry. Kinzua area, Oregon.
USDA Forest Service:
1948. Helicopter and tank truck. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Spray boom on Bell helicopter. Gail Thomas (left) and John Woods, Jr. Spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Bell helicopter. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Helicopter taking off from Kinzua road. Western spruce budworm control project. Kinzua, Oregon.
USDA Forest Service:
1948. Helicopter taking off from Kinzua Road. Spruce budworm control project. Kinzua, Oregon.
USDA Forest Service:
1948. Helicopter en-route with spray. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Helicopter en-route with spray. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Helicopter spraying (spray does not show). Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Budworm damage to pine-fir stand on slopes of Tamarack Mountain. Defoliated fir appears as light gray to white as compared with darker, undefoliated ponderosa pine.
USDA Forest Service:
1948. Helicopter spraying. Spray is visible by refracted light. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Helicopter spraying; spray is visible by refracted light. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Cloth collecting tray beneath an infested fir, used to sample western spruce budworm fall following DDT spray. Western spruce budworm control project. Kinzua area, Oregon.
USDA Forest Service:
1948. Western spruce budworm defoliation of Douglas-fir and white fir. Tupper area. Umatilla National Forest, Oregon.
USDA Forest Service:
1948. Douglas-fir and white fir defoliation. Tupper area. Umatilla National Forest, Oregon.
USDA Forest Service:
1949. B-18, three Stearmans, and spray loading equipment. Mt. Hood area, Oregon.
USDA Forest Service:
1949. B-18 spraying on western spruce budworm project. Mt. Hood area, Oregon.
