USDA Forest Service:
1940. A dilute solution of sulphuric acid is spread evenly over the seed beds after seeding and rolling in order to sterilize the soil to prevent damping-off disease from infecting the new seedlings. Chippewa National Forest, Michigan.
USDA Forest Service:
1952. Drawing and measuring sulphuric acid for disinfecting seedbeds. Chittenden Nursery. Lower Michigan National Forest, Michigan.
USDA Forest Service:
1952. Disinfecting seedbeds with sulphuric acid after sowing to control damping off. Chittenden Nursery. Lower Michigan National Forest, Michigan.
USDA Forest Service:
1953. Pumping allyl alcohol from a drum to prayer tank. Huron-Manistee National Forest, Michigan.
USDA Forest Service:
1959. Virgil Allen, Denny Ahl Manager, operating a machine at the Wind River Nursery used to de-wing and clean Douglas-fir seed extracted from cones from insecticide tests at the Denny Ahl Seed Orchard. Carson, Washington.
USDA Forest Service:
1959. Tumbler used for extracting seed from sprayed and unsprayed cones. Tom Greathouse operating. Hemlock R.S. Gifford Pinchot NF, WA.
USDA Forest Service:
1959. Tumbler used for extracting seed from sprayed and unsprayed cones. Tom Greathouse operating. Hemlock Ranger Station, Gifford Pinchot National Forest, Washington.
USDA Forest Service:
1959. Orchard Manager Virgil Allen showing an abnormally heavy cone set on a fertilized 8-foot Douglas-fir graft at Denny Ahl Seed Orchard, Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1960. Entomologist Peter W. Orr examines mugho pine at City Nursery for European pine shoot moth. Portland, Oregon.
USDA Forest Service:
1961. Test is made for gas leaks along rolled joint between sidewall and ground sheet by Clarence Hamilton. Bonnebrook Nursery, Washington.
USDA Forest Service:
1961. WDNR men engaged in tree owner sign up, observe the fumigation procedure. Walter Smith - Port Orchard; Al O'Donnell - Olympia; John Martin - Port Orchard; Gene Hayfield - Sultan. USFS crew: Clarence Hamilton, Wayne Small, Gerry Sabin.
USDA Forest Service:
1961. Crew foreman Gerry Sabin taking a gas density reading on the fumiscope. 110 volt battery by use of an inverter. Bonnebrook Nursery, Washington State.
USDA Forest Service:
1961. Fumigator Wayne Small places plastic tubing to get gas density reading during fumigation. Bonnebrook Nursery, Washington State.
USDA Forest Service:
1962. Dennis Ahl Seed Orchard. Shelton, Washington.
USDA Forest Service:
1962. Newly-grafted Douglas-fir. Dennis Ahl Seed Orchard. Shelton, Washington.
USDA Forest Service:
1962. L-R: Orchard manager Virgil Allen, Tom Greathouse, and Paul Lauterbach examining pollinated flowers. Denny Ahl Seed Orchard. Shelton, Washington.
USDA Forest Service:
1962. Tom Greathouse examining grafted Douglas-fir. Denny Ahl Seed Orchard. Shelton, Washington.
USDA Forest Service:
1962. Tom Greathouse examining grafted Douglas-fir. Dennis Ahl Seed Orchard. Shelton, Washington.
USDA Forest Service:
1962. Darrell Barstow with heavy cone crop on grafted Douglas-fir. Trees were sprayed with DDT, guthion, and sevin to control the midge Contarinia oregonensis. Dennis Ahl Seed Orchard. Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1962. Darrell Barstow with heavy cone crop on grafted Douglas-fir. Trees were sprayed with DDT, guthion, and sevin to control the midge Contarinia oregonensis. Dennis Ahl Seed Orchard. Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1962. Darrell Barstow with heavy cone crop on grafted Douglas-fir. Trees were sprayed with DDT, guthion, and sevin to control the midge Contarinia oregonensis. Dennis Ahl Seed Orchard. Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1962. Orchard manager Virgil Allen testing Dynafog Model 70 fog machine used for pest control. Machine has jet engine and disseminates only oil-based materials. Denny Ahl Seed Orchard. Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1962. Orchard manager Virgil Allen testing Dynafog Model 70 fog machine used for pest control. Machine has jet engine and disseminates only oil-based materials. Denny Ahl Seed Orchard, Shelton Ranger District, Olympic National Forest, Washington.
USDA Forest Service:
1962. J. Rogers, Robert Dolph, and John Wortendyke. Applying soil for seal on fumigation chamber for Methyl Bromide. European pine shoot moth control. Wind River Nursery, Washington.
USDA Forest Service:
1962. L-R: Bob Dolph, C. Fink, and J. Rogers with a fumigation chamber for Methyl Bromide. Euopean pine shoot moth control. Wind River Nursery, Washington.
USDA Forest Service:
1963. Root of western white pine sapling in Jim Creek Seed Orchard killed by weevils (Pissodes sp.) Rogue River National Forest, Oregon.
USDA Forest Service:
1971. Dave Johnson with a healthy Douglas-fir. Beaver Creek Seed Orchard. Philomath, Oregon.
USDA Forest Service:
1971. Equipment used for seed bed fumigation. Bend Nursery, Oregon.
USDA Forest Service:
1971. Equipment used for seed bed fumigation. Bend Nursery, Oregon.
USDA Forest Service:
1971. Seed bed prepared for fumigation. Bend Nursery, Oregon.
