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• 51. [Article] Evaluation of mountain pine beetle in high use areas and other infested stands on the Hebgen Lake Ranger District, Gallatin National Forest, 1977

  Mountain pine beetle populations reached epidemic level on the Hebgen Lake Ranger District in 1970. Infested area increased from 6,680 acres in 1970 to 78,000 acres in 1977. Buildup ratio of trees killed ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle in high use areas and other infested stands on the Hebgen Lake Ranger District, Gallatin National Forest, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, United States. Forest Service. Northern Region. Forest Insect and Disease Management, McGregor, Mark D. Mountain pine beetle populations reached epidemic level on the Hebgen Lake Ranger District in 1970. Infested area increased from 6,680 acres in 1970 to 78,000 acres in 1977. Buildup ratio of trees killed in 1976 to trees killed in 1977 is 1:8. Approximately 1,700,000 trees, containing 175 MMBF of merchantable timber, are currently infested. An accelerated program of logging infested trees and silvicultural treatment to reduce the inventory of large diameter trees is recommended. In high use areas (campgrounds and administrative sites), 3,027 trees are currently infested. Buildup ratio is expected to exceed 1:1 in 1978. In high use areas all green lodgepole pine 7 inches d.b.h. and larger, which are to be retained, should be sprayed with the protective spray Sevimol 4. Infested trees should be removed prior to July 1, 1978. Trees that have been dead for several years may be a hazard and should be removed. Title: Evaluation of mountain pine beetle in high use areas and other infested stands on the Hebgen Lake Ranger District, Gallatin National Forest, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, United States. Forest Service. Northern Region. Forest Insect and Disease Management, McGregor, Mark D. Mountain pine beetle populations reached epidemic level on the Hebgen Lake Ranger District in 1970. Infested area increased from 6,680 acres in 1970 to 78,000 acres in 1977. Buildup ratio of trees killed in 1976 to trees killed in 1977 is 1:8. Approximately 1,700,000 trees, containing 175 MMBF of merchantable timber, are currently infested. An accelerated program of logging infested trees and silvicultural treatment to reduce the inventory of large diameter trees is recommended. In high use areas (campgrounds and administrative sites), 3,027 trees are currently infested. Buildup ratio is expected to exceed 1:1 in 1978. In high use areas all green lodgepole pine 7 inches d.b.h. and larger, which are to be retained, should be sprayed with the protective spray Sevimol 4. Infested trees should be removed prior to July 1, 1978. Trees that have been dead for several years may be a hazard and should be removed. Close

• 52. [Article] Evaluation of the Douglas-fir beetle infestation : North Fork Clearwater River drainage, northern Idaho, 1970-73

  An outbreak of Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., 40-4 began in 1969 in the North Fork Clearwater River drainage in northern Idaho. This infestation probably resulted from trees felled ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of the Douglas-fir beetle infestation : North Fork Clearwater River drainage, northern Idaho, 1970-73 Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. An outbreak of Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., 40-4 began in 1969 in the North Fork Clearwater River drainage in northern Idaho. This infestation probably resulted from trees felled during clearing for the Dworshak Reservoir, from ice and snow breakage which occurred during the winter of 1968-69 in stands adjacent to the proposed reservoir, and an abundance of mature and overmature Douglas-fir within the drainage. The outbreak reached epidemic proportions in 1970, 40 but was not detected until 1971. To determine impact of this insect on Douglas-fir stands within the area of infestation and establish a base from which to conduct salvage logging, a two-stage survey using aerial photography followed by a ground cruise was conducted in 1971, 1972, and 1973. Area surveyed varied from 288,000 acres in 1971 to 494,000 in 1972, and was reduced 410 to 287,000 acres in 1973. The 1971 survey estimated that 174,164 trees were killed during the 2-year period 1970-71, resulting in a volume loss of 85.8 MMBF of Douglas-fir sawtimber on 288,000 acres. In 1972, an estimated 46,844 trees were killed with a volume loss of about 17.8 MMBF on 494,000 acres. In 1973, the survey estimated that 8,141 trees were killed with a volume loss of 4.2 MMIIF of merchantable timber on 287,000 acres. The infestation has been declining since 1971. Title: Evaluation of the Douglas-fir beetle infestation : North Fork Clearwater River drainage, northern Idaho, 1970-73 Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. An outbreak of Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., 40-4 began in 1969 in the North Fork Clearwater River drainage in northern Idaho. This infestation probably resulted from trees felled during clearing for the Dworshak Reservoir, from ice and snow breakage which occurred during the winter of 1968-69 in stands adjacent to the proposed reservoir, and an abundance of mature and overmature Douglas-fir within the drainage. The outbreak reached epidemic proportions in 1970, 40 but was not detected until 1971. To determine impact of this insect on Douglas-fir stands within the area of infestation and establish a base from which to conduct salvage logging, a two-stage survey using aerial photography followed by a ground cruise was conducted in 1971, 1972, and 1973. Area surveyed varied from 288,000 acres in 1971 to 494,000 in 1972, and was reduced 410 to 287,000 acres in 1973. The 1971 survey estimated that 174,164 trees were killed during the 2-year period 1970-71, resulting in a volume loss of 85.8 MMBF of Douglas-fir sawtimber on 288,000 acres. In 1972, an estimated 46,844 trees were killed with a volume loss of about 17.8 MMBF on 494,000 acres. In 1973, the survey estimated that 8,141 trees were killed with a volume loss of 4.2 MMIIF of merchantable timber on 287,000 acres. The infestation has been declining since 1971. Close

• 53. [Article] Status of mountain pine beetle infestations, Gallatin District, Gallatin National Forest, 1973

  Mountain pine beetle infestations have continued at epidemic level in lodgepole pine stands since 1969 in the West Gallatin River drainage. This infestation has increased at about a 1.9:1 buildup ratio ...

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestations, Gallatin District, Gallatin National Forest, 1973 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Mountain pine beetle infestations have continued at epidemic level in lodgepole pine stands since 1969 in the West Gallatin River drainage. This infestation has increased at about a 1.9:1 buildup ratio annually. Since the outbreak began in 1969, surveys indicate that approximately 22,354 merchantable size trees have been killed with an estimated volume loss of 1,061 MMBF. This is a total of about 27 percent of the merchantable lodgepole pine within areas surveyed. Additional tree mortality and volume loss have occurred, but not all infested areas were surveyed due to land exchange between Big Sky Corporation, Burlington Northern Railroad, and the Forest Service. Operational control of felling and burning, and salvage logging of infested trees was initiated in 1971. This action did little to slow the impetus of the outbreak, because the complete infestation could not be suppressed. The outbreak is expected to continue at epidemic levels in 1974, with an increase in the number of infested trees. A cooperative administrative study between the Northern Region and Intermountain Forest and Range Experiment Station is planned in fiscal year 1975 to determine if silvicultural methods can be used to control mountain pine beetle in mature and overmature overstocked lodgepole pine stands on the Gallatin National Forest. Title: Status of mountain pine beetle infestations, Gallatin District, Gallatin National Forest, 1973 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Mountain pine beetle infestations have continued at epidemic level in lodgepole pine stands since 1969 in the West Gallatin River drainage. This infestation has increased at about a 1.9:1 buildup ratio annually. Since the outbreak began in 1969, surveys indicate that approximately 22,354 merchantable size trees have been killed with an estimated volume loss of 1,061 MMBF. This is a total of about 27 percent of the merchantable lodgepole pine within areas surveyed. Additional tree mortality and volume loss have occurred, but not all infested areas were surveyed due to land exchange between Big Sky Corporation, Burlington Northern Railroad, and the Forest Service. Operational control of felling and burning, and salvage logging of infested trees was initiated in 1971. This action did little to slow the impetus of the outbreak, because the complete infestation could not be suppressed. The outbreak is expected to continue at epidemic levels in 1974, with an increase in the number of infested trees. A cooperative administrative study between the Northern Region and Intermountain Forest and Range Experiment Station is planned in fiscal year 1975 to determine if silvicultural methods can be used to control mountain pine beetle in mature and overmature overstocked lodgepole pine stands on the Gallatin National Forest. Close

• 54. [Article] Evaluation of mountain pine beetle infestations, Big Belt Mountains, Townsend District, Helena National Forest--1973

  Mountain pine beetle, Dendroctonus ponderosas Hopk., reached near epidemic levels in lodgepole pine stands in the Sulphur Creek-Black Butte area. Lodgepole pine are probably more susceptible due to the ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle infestations, Big Belt Mountains, Townsend District, Helena National Forest--1973 Author: Meyer, Hubert E., United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. Mountain pine beetle, Dendroctonus ponderosas Hopk., reached near epidemic levels in lodgepole pine stands in the Sulphur Creek-Black Butte area. Lodgepole pine are probably more susceptible due to the overstocked conditions of stands, and high incidence of girdling of the base of trees by porcupines. The infestation in this area was classified as static with a decreasing trend. Mountain pine beetle and pine engraver beetle, Ips spp., increased to epidemic levels in blowdown and top-broken second-growth ponderosa pine in the North Fork of Roy and Grunett Creek drainages on State, private and Bureau of Land Management lands. Several hundred ponderosa pines are now infested. Sufficient brood is present to cause an increase in number of trees killed in 1974. Several hundred subalpine fir were killed by the fir engraver beetle, Scolytus ventralis Lec., the western balsam bark beetle, Dryocoetes conftisus Sw., and Fityokteines sp. Faded tree groups occur from Duck Creek Pass north to Slough Creek. Most infested groups are adjacent to current or recent logging activity that provided slash and served as a breeding site and source of population buildup. Title: Evaluation of mountain pine beetle infestations, Big Belt Mountains, Townsend District, Helena National Forest--1973 Author: Meyer, Hubert E., United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. Mountain pine beetle, Dendroctonus ponderosas Hopk., reached near epidemic levels in lodgepole pine stands in the Sulphur Creek-Black Butte area. Lodgepole pine are probably more susceptible due to the overstocked conditions of stands, and high incidence of girdling of the base of trees by porcupines. The infestation in this area was classified as static with a decreasing trend. Mountain pine beetle and pine engraver beetle, Ips spp., increased to epidemic levels in blowdown and top-broken second-growth ponderosa pine in the North Fork of Roy and Grunett Creek drainages on State, private and Bureau of Land Management lands. Several hundred ponderosa pines are now infested. Sufficient brood is present to cause an increase in number of trees killed in 1974. Several hundred subalpine fir were killed by the fir engraver beetle, Scolytus ventralis Lec., the western balsam bark beetle, Dryocoetes conftisus Sw., and Fityokteines sp. Faded tree groups occur from Duck Creek Pass north to Slough Creek. Most infested groups are adjacent to current or recent logging activity that provided slash and served as a breeding site and source of population buildup. Close

• 55. [Article] An evaluation of a developing mountain pine beetle infestation in Centennial Valley, Montana, 1979

  The mountain pine beetle infestation on Bureau of Land Management lands in Centennial Valley has increased from about 500 acres in 1977 to more than 7,000 in 1979. Average number of trees per acre killed ...

  Citation × Citation Citation Abstract Copy Title: An evaluation of a developing mountain pine beetle infestation in Centennial Valley, Montana, 1979 Author: United States. Forest Service. Northern Region. State & Private Forestry, Gibson, K. E. (Kenneth E.), McGregor, Mark D., Bennett, D. D. The mountain pine beetle infestation on Bureau of Land Management lands in Centennial Valley has increased from about 500 acres in 1977 to more than 7,000 in 1979. Average number of trees per acre killed has more than quadrupled, increasing from 9.8 in 1977 to 47.8 in 1979. Predictions for the future of the infestation, plus management alternatives to lessen the severity of the outbreak are discussed. Title: An evaluation of a developing mountain pine beetle infestation in Centennial Valley, Montana, 1979 Author: United States. Forest Service. Northern Region. State & Private Forestry, Gibson, K. E. (Kenneth E.), McGregor, Mark D., Bennett, D. D. The mountain pine beetle infestation on Bureau of Land Management lands in Centennial Valley has increased from about 500 acres in 1977 to more than 7,000 in 1979. Average number of trees per acre killed has more than quadrupled, increasing from 9.8 in 1977 to 47.8 in 1979. Predictions for the future of the infestation, plus management alternatives to lessen the severity of the outbreak are discussed. Close

• 56. [Article] Establishment report : permanent mountain pine beetle population trend plots, Montana, 1979

  Thirty permanent mountain pine beetle population trend plots were established in each of six areas in the state in 1979. Infestation levels ranged from 0 to 47.8 new attacks per acre. The potential for ...

  Citation × Citation Citation Abstract Copy Title: Establishment report : permanent mountain pine beetle population trend plots, Montana, 1979 Author: Bennett, D. D., Gibson, K. E. (Kenneth E.), United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. Thirty permanent mountain pine beetle population trend plots were established in each of six areas in the state in 1979. Infestation levels ranged from 0 to 47.8 new attacks per acre. The potential for increased mortality is considered high for all areas. Each area will be evaluated for 5 years to determine the course of the infestation and resultant impact to the stands. Title: Establishment report : permanent mountain pine beetle population trend plots, Montana, 1979 Author: Bennett, D. D., Gibson, K. E. (Kenneth E.), United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. Thirty permanent mountain pine beetle population trend plots were established in each of six areas in the state in 1979. Infestation levels ranged from 0 to 47.8 new attacks per acre. The potential for increased mortality is considered high for all areas. Each area will be evaluated for 5 years to determine the course of the infestation and resultant impact to the stands. Close

• 57. [Article] Evaluation of mountain pine beetle infestations, Thompson River Drainage, Plains District, Lolo National Forest, Montana, 1976

  Mountain pine beetle developed to epidemic levels in lodgepole pine stands in the Thompson River drainage in 1971. Approximately 506,616 trees are infested on 4,444 hectares. Based on buildup ratios, infestations ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle infestations, Thompson River Drainage, Plains District, Lolo National Forest, Montana, 1976 Author: McGregor, Mark D., Oakes, Robert D., Hamel, Dennis R. Mountain pine beetle developed to epidemic levels in lodgepole pine stands in the Thompson River drainage in 1971. Approximately 506,616 trees are infested on 4,444 hectares. Based on buildup ratios, infestations are expected to intensify; develop in uninfected stands; and kill about 1,763,024 trees in 1977. Salvage logging of infested trees and silvicultural management to reduce the average stand diameter below 20 cm d.b.h. are recommended to manage the infestation. Title: Evaluation of mountain pine beetle infestations, Thompson River Drainage, Plains District, Lolo National Forest, Montana, 1976 Author: McGregor, Mark D., Oakes, Robert D., Hamel, Dennis R. Mountain pine beetle developed to epidemic levels in lodgepole pine stands in the Thompson River drainage in 1971. Approximately 506,616 trees are infested on 4,444 hectares. Based on buildup ratios, infestations are expected to intensify; develop in uninfected stands; and kill about 1,763,024 trees in 1977. Salvage logging of infested trees and silvicultural management to reduce the average stand diameter below 20 cm d.b.h. are recommended to manage the infestation. Close