USDA Forest Service:
1924. Spraying lead arsenate on sawfly and needletier infested lodgepole pines. West Yellowstone, Montana.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1931. Western hemlock looper control project. Pacific and Grays Harbor Counties, Washington.
USDA Forest Service:
1934. Spraying street trees for insect control. New York.
USDA Forest Service:
1936. First of 7 views of tree-spraying autogyro. Loaded by hose from tank truck with lead arsenate and fish oil solution - for control of tent caterpillar and gypsy moth. Massachusetts.
USDA Forest Service:
1945. Adding fish oil to lead arsenate concentrate. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Aerial view of Seaside airstrip. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. DDT transfer. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Mixing lead arsenate spray. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Seaside airstrip with drums of fish oil and solvent in the foreground. Western hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Adding fish oil to lead arsenate concentrate. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Mixing lead arsenate. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Mixing lead arsenate. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Loading spray plane. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1945. Airplane taking off. Hemlock looper control project. Clatsop County, Oregon.
USDA Forest Service:
1946. Member of spray crew spraying trunk of tree with chemical to kill the beetles. Ashley National Forest, Utah.
USDA Forest Service:
1947. A chemical, Orthodichlorobenzene, in an oil solution was sprayed on the bark of lodgepole pine infested with mountain pine beetle. Crater Lake National Park, Oregon.
USDA Forest Service:
1947. Jeep equipped with spray pump tank and 500 feet of hose for treating bark beetle infested trees. Black Hills National Forest, South Dakota.
USDA Forest Service:
1947. Jeep with spray pump tank for treating bark beetle infested trees. Black Hills National Forest, South Dakota.
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:
1949. B-18, three Stearmans, and spray loading equipment. Mt. Hood area, Oregon.
USDA Forest Service:
1949. Stearmans and BTs in spray loading area. Western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
1949. Stearmans at loading tanks. Western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
1949. Stearman and BT-19 at loading area. Western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
1949. Loaded BT-19, ready for takeoff. Western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
1949. BT-19 being loaded with spray. Western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
1949. L-R: Amos Smeltzer (USFS), Walter J. Buckhorn (BEPQ), Ace Deemers, and John F. Wear (BEPQ) checking western spruce budworm spray areas on Mt. Hood project map. Mt. Hood area, Oregon.
USDA Forest Service:
1949. R. Watson, W.A. Shiley, H. Heer and E. Price waiting for weather information on Mt. Hood western spruce budworm control project. Mt. Hood area, Oregon.
USDA Forest Service:
c.1950. Treating felled logs for bark beetles with ethylene dibromide (EDB) insecticide. A heavy concentration is applied with a watering can.
