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• 1. [Article] A pine butterfly impact survey on the Bitterroot National Forest and state of Montana lands, 1973

  Citation × Citation Citation Abstract Copy Title: A pine butterfly impact survey on the Bitterroot National Forest and state of Montana lands, 1973 Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry Title: A pine butterfly impact survey on the Bitterroot National Forest and state of Montana lands, 1973 Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry Close

• 2. [Article] Regional summary of forest insects and diseases, 1979

  Citation × Citation Citation Abstract Copy Title: Regional summary of forest insects and diseases, 1979 Author: Dooling, Oscar J., United States. Forest Service. Northern Region. State & Private Forestry Title: Regional summary of forest insects and diseases, 1979 Author: Dooling, Oscar J., United States. Forest Service. Northern Region. State & Private Forestry Close

• 3. [Article] Western spruce budworm in the Northern Region in 1977 and predictions for defoliation in 1978

  Citation × Citation Citation Abstract Copy Title: Western spruce budworm in the Northern Region in 1977 and predictions for defoliation in 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Flavell, Thomas H. Title: Western spruce budworm in the Northern Region in 1977 and predictions for defoliation in 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Flavell, Thomas H. Close

• 4. [Article] Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977

  Epidemic populations of the western spruce budworm persist in the Northern Region. Aerial surveys made in August 1976 showed a decline in the acreage of aerially visible defoliation. In northern Idaho, ...

  Citation × Citation Citation Abstract Copy Title: Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, Tunnock, Scott Epidemic populations of the western spruce budworm persist in the Northern Region. Aerial surveys made in August 1976 showed a decline in the acreage of aerially visible defoliation. In northern Idaho, the defoliated area dropped from 831,487 acres in 1975 to 655,711 acres in 1976, down 21 percent. Surveys in Montana found a net decrease in defoliation of 11 percent, down from 2,797,986 in 1975 to 2,496,274 in 1976. Egg mass surveys made in September and October 1976 indicate that defoliation will be light on the Clearwater and Nezperce National Forests and moderate on the Idaho Panhandle National Forests, Idaho, in 1977. Defoliation in Montana during 1977 is expected to be light on the Flathead, moderate on the Kootenai, and heavy on the Beaverhead, Bitterroot, Deerlodge, Gallatin, Helena, Lewis and Clark, and Lolo National Forests and the Flathead Indian Reservation. Title: Potential for defoliation by western spruce budworm in northern Idaho and Montana, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, Tunnock, Scott Epidemic populations of the western spruce budworm persist in the Northern Region. Aerial surveys made in August 1976 showed a decline in the acreage of aerially visible defoliation. In northern Idaho, the defoliated area dropped from 831,487 acres in 1975 to 655,711 acres in 1976, down 21 percent. Surveys in Montana found a net decrease in defoliation of 11 percent, down from 2,797,986 in 1975 to 2,496,274 in 1976. Egg mass surveys made in September and October 1976 indicate that defoliation will be light on the Clearwater and Nezperce National Forests and moderate on the Idaho Panhandle National Forests, Idaho, in 1977. Defoliation in Montana during 1977 is expected to be light on the Flathead, moderate on the Kootenai, and heavy on the Beaverhead, Bitterroot, Deerlodge, Gallatin, Helena, Lewis and Clark, and Lolo National Forests and the Flathead Indian Reservation. Close

• 5. [Article] Mountain pine beetle impact survey, Ninemile Drainage, Lolo National Forest, and state and private lands, Montana, 1973

  The mountain pine beetle reached epidemic levels in second-growth 80-yearold ponderosa pine stands on the Ninemile Ranger District in 1969. The outbreak increased through 1971 and spread over 30,000 acres. ...

  Citation × Citation Citation Abstract Copy Title: Mountain pine beetle impact survey, Ninemile Drainage, Lolo National Forest, and state and private lands, Montana, 1973 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry The mountain pine beetle reached epidemic levels in second-growth 80-yearold ponderosa pine stands on the Ninemile Ranger District in 1969. The outbreak increased through 1971 and spread over 30,000 acres. Heavy infestation occurred on about 2,600 acres within this area. A two-stage survey was used during 1972 and 1973 to stratify the infestation, and obtain tree and volume loss estimates. This survey shows that about 109,284 trees were killed with an estimated volume loss of 613,743 board feet from 1970 to 1973. The outbreak has been declining since 1971. Surveys this year point toward a continued decline. However, some "hot spot" infestations will persist in pure,overstocked,second-growth stands. Commercial thinning is encouraged to release the stand, promote tree growth, and change the microenvironment, making it unattractive to mountain pine beetle. Title: Mountain pine beetle impact survey, Ninemile Drainage, Lolo National Forest, and state and private lands, Montana, 1973 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry The mountain pine beetle reached epidemic levels in second-growth 80-yearold ponderosa pine stands on the Ninemile Ranger District in 1969. The outbreak increased through 1971 and spread over 30,000 acres. Heavy infestation occurred on about 2,600 acres within this area. A two-stage survey was used during 1972 and 1973 to stratify the infestation, and obtain tree and volume loss estimates. This survey shows that about 109,284 trees were killed with an estimated volume loss of 613,743 board feet from 1970 to 1973. The outbreak has been declining since 1971. Surveys this year point toward a continued decline. However, some "hot spot" infestations will persist in pure,overstocked,second-growth stands. Commercial thinning is encouraged to release the stand, promote tree growth, and change the microenvironment, making it unattractive to mountain pine beetle. Close