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• 1. [Article] Bark beetle conditions, Northern Region, 1978

  Citation × Citation Citation Abstract Copy Title: Bark beetle conditions, Northern Region, 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Gibson, K. E. (Kenneth E.), McGregor, Mark D., Bennett, D. D. Title: Bark beetle conditions, Northern Region, 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Gibson, K. E. (Kenneth E.), McGregor, Mark D., Bennett, D. D. Close

• 2. [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

• 3. [Article] Progress report on spruce budworm damage in Idaho and Montana, 1978

  Citation × Citation Citation Abstract Copy Title: Progress report on spruce budworm damage in Idaho and Montana, 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Bousfield, Wayne E. Title: Progress report on spruce budworm damage in Idaho and Montana, 1978 Author: United States. Forest Service. Northern Region. State & Private Forestry, Bousfield, Wayne E. Close

• 4. [Article] Establishment report : permanent plots to evaluate the effects of Armillaria root disease in precommercially thinned stands

  Methods used to establish permanent plots in precommercially thinned and unthinned stands to monitor root disease development are described. Plots were established in 22 Armillaria-infested stands in northern ...

  Citation × Citation Citation Abstract Copy Title: Establishment report : permanent plots to evaluate the effects of Armillaria root disease in precommercially thinned stands Author: Stewart, C. A., United States. Forest Service. Northern Region. State & Private Forestry, Hall, L. D., Byler, James W. Methods used to establish permanent plots in precommercially thinned and unthinned stands to monitor root disease development are described. Plots were established in 22 Armillaria-infested stands in northern Idaho and western Montana. The proportion of trees dead and infected was significantly higher for planted than for natural regeneration at the time of plot establishment. Title: Establishment report : permanent plots to evaluate the effects of Armillaria root disease in precommercially thinned stands Author: Stewart, C. A., United States. Forest Service. Northern Region. State & Private Forestry, Hall, L. D., Byler, James W. Methods used to establish permanent plots in precommercially thinned and unthinned stands to monitor root disease development are described. Plots were established in 22 Armillaria-infested stands in northern Idaho and western Montana. The proportion of trees dead and infected was significantly higher for planted than for natural regeneration at the time of plot establishment. Close

• 5. [Article] An assessment of dwarf mistletoes in Montana

  Dwarf mistletoes reduce tree height and diameter, and thereby cause a reduction in volume production. We estimate that volume reduction in Montana is about 33.2 MM cubic feet per year. Mistletoe effects ...

  Citation × Citation Citation Abstract Copy Title: An assessment of dwarf mistletoes in Montana Author: Dooling, Oscar J., United States. Forest Service. Northern Region. State & Private Forestry, Eder, Robert G. Dwarf mistletoes reduce tree height and diameter, and thereby cause a reduction in volume production. We estimate that volume reduction in Montana is about 33.2 MM cubic feet per year. Mistletoe effects are problems in some areas because of the demands we have placed on the Forests for goods and services. Much of their impact can be reduced to levels consistent with resource management objectives through cultural practices. The resource manager considers information on the stands, pest-caused losses, and environmental and social considerations in deciding for or against cultural control. Title: An assessment of dwarf mistletoes in Montana Author: Dooling, Oscar J., United States. Forest Service. Northern Region. State & Private Forestry, Eder, Robert G. Dwarf mistletoes reduce tree height and diameter, and thereby cause a reduction in volume production. We estimate that volume reduction in Montana is about 33.2 MM cubic feet per year. Mistletoe effects are problems in some areas because of the demands we have placed on the Forests for goods and services. Much of their impact can be reduced to levels consistent with resource management objectives through cultural practices. The resource manager considers information on the stands, pest-caused losses, and environmental and social considerations in deciding for or against cultural control. Close

• 6. [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

• 7. [Article] An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II

  Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several ...

  Citation × Citation Citation Abstract Copy Title: An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry, Jenkins, Michael J. Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several collecting periods were injured. Moderate damage (40-70 percent of cones injured) occurred to Douglas-fir, ponderosa pine, western larch, and western white pine from a few areas. Light damage (less than 40 percent) occurred on western white pine cones from a few seed production areas, and to all lodgepole pine and western hemlock cones collected. The primary insect species observed were western spruce budworm on Douglas-fir and western larch; midges on Douglas-fir, western larch, ponderosa pine, and lodgepole pine; cone worms on Douglas-fir, western larch, and ponderosa pine; and the Douglas-fir cone moth on Douglas-fir. Title: An evaluation of cone and seed insects in selected seed production areas in Region 1 : progress report II Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry, Jenkins, Michael J. Insect damage was extensive to Douglas-fir, ponderosa pine, western white pine, and western larch cones at most seed production areas surveyed in 1979. From 70 to 100 percent of the cones from several collecting periods were injured. Moderate damage (40-70 percent of cones injured) occurred to Douglas-fir, ponderosa pine, western larch, and western white pine from a few areas. Light damage (less than 40 percent) occurred on western white pine cones from a few seed production areas, and to all lodgepole pine and western hemlock cones collected. The primary insect species observed were western spruce budworm on Douglas-fir and western larch; midges on Douglas-fir, western larch, ponderosa pine, and lodgepole pine; cone worms on Douglas-fir, western larch, and ponderosa pine; and the Douglas-fir cone moth on Douglas-fir. Close

• 8. [Article] Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979

  Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased ...

  Citation × Citation Citation Abstract Copy Title: Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979 Author: United States. Forest Service. Northern Region. State & Private Forestry, Hard, John S., Eder, Robert G., Tunnock, Scott Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased from 1.7 million acres in 1969 to a high of 2.2 million acres in 1974, and declined to none in 1979. Defoliated area in western Montana increased from 1.8 million acres in 1969 to a high of 2.8 million acres in 1972 and declined to 0.6 million acres in 1979. Conversely, defoliated area in eastern Montana fluctuated at low levels between 0.1 and 0.7 million acres between 1969 and 1974, and then rose to a high of 1.6 million acres in 1979. Analysis of defoliation trend, the ratio of acres defoliated in the current year by acres defoliated the prior year, and weather during budworm larval and pupal periods during the past decade revealed the following relationships: Defoliation trend in all three geographic areas varied (a) directly with mean maximum temperature during May, June, and July of the year before, and (b) inversely with frequency of measurable precipitation during May, June, and July of the year before. Based on warm, dry conditions throughout the Region in 1979, we predict a general increase in budworm populations in the Northern Region in 1980. Title: Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979 Author: United States. Forest Service. Northern Region. State & Private Forestry, Hard, John S., Eder, Robert G., Tunnock, Scott Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased from 1.7 million acres in 1969 to a high of 2.2 million acres in 1974, and declined to none in 1979. Defoliated area in western Montana increased from 1.8 million acres in 1969 to a high of 2.8 million acres in 1972 and declined to 0.6 million acres in 1979. Conversely, defoliated area in eastern Montana fluctuated at low levels between 0.1 and 0.7 million acres between 1969 and 1974, and then rose to a high of 1.6 million acres in 1979. Analysis of defoliation trend, the ratio of acres defoliated in the current year by acres defoliated the prior year, and weather during budworm larval and pupal periods during the past decade revealed the following relationships: Defoliation trend in all three geographic areas varied (a) directly with mean maximum temperature during May, June, and July of the year before, and (b) inversely with frequency of measurable precipitation during May, June, and July of the year before. Based on warm, dry conditions throughout the Region in 1979, we predict a general increase in budworm populations in the Northern Region in 1980. Close