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• 31. [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

• 32. [Article] Evaluation of a mountain pine beetle infestation, Shook Mountain, Sula District, Bitterroot National Forest, 1977

  A mountain pine beetle outbreak developed on the north face of Shook Mountain in 1972. Beetle populations increased, and have continued at an epidemic level since 1973. Surveys show 404,798 ponderosa pine ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of a mountain pine beetle infestation, Shook Mountain, Sula District, Bitterroot National Forest, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle outbreak developed on the north face of Shook Mountain in 1972. Beetle populations increased, and have continued at an epidemic level since 1973. Surveys show 404,798 ponderosa pine containing 12,173,940 bd. ft. volume of merchantable timber; and 20,875 lodgepole pine containing 730,625 bd. ft. volume of merchantable timber were killed from 1974 through 1976. Losses will continue as long as stands remain overstocked and stagnated. Reducing basal area below 120 ft. /acre by thinning and removing infested trees will manage the infestation. Suggestions are given to prevent buildup of secondary bark beetles. Title: Evaluation of a mountain pine beetle infestation, Shook Mountain, Sula District, Bitterroot National Forest, 1977 Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle outbreak developed on the north face of Shook Mountain in 1972. Beetle populations increased, and have continued at an epidemic level since 1973. Surveys show 404,798 ponderosa pine containing 12,173,940 bd. ft. volume of merchantable timber; and 20,875 lodgepole pine containing 730,625 bd. ft. volume of merchantable timber were killed from 1974 through 1976. Losses will continue as long as stands remain overstocked and stagnated. Reducing basal area below 120 ft. /acre by thinning and removing infested trees will manage the infestation. Suggestions are given to prevent buildup of secondary bark beetles. Close

• 33. [Article] Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana

  A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 ...

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 million board feet of lodgepole and ponderosa pine were killed during the outbreak. Overstocking resulted in slow growth which probably promoted a general weakening of the stand, making some trees more susceptible to attack by mountain pine beetle. Two factors that might be contributing to the decline of the outbreak are: 1. The influence of Ips spp. drying out the cambial area in infested trees. 2. The average size of trees being attacked is less than 10 inches d.b.h., resulting in fewer beetles emerging from infested trees than parent adults that attacked. Title: Status of mountain pine beetle infestations on the Superior Ranger District, Lolo National Forest, St. Regis, Montana Author: United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D. A mountain pine beetle infestation has been active in the St. Regis area since 1964. Heaviest tree mortality occurred during the period 1969-70. The infestation has continued to decline since 1970. Over 2 million board feet of lodgepole and ponderosa pine were killed during the outbreak. Overstocking resulted in slow growth which probably promoted a general weakening of the stand, making some trees more susceptible to attack by mountain pine beetle. Two factors that might be contributing to the decline of the outbreak are: 1. The influence of Ips spp. drying out the cambial area in infested trees. 2. The average size of trees being attacked is less than 10 inches d.b.h., resulting in fewer beetles emerging from infested trees than parent adults that attacked. Close

• 34. [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

• 35. [Article] Status of mountain pine beetle infestations, Northern Region, 1984

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestations, Northern Region, 1984 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Title: Status of mountain pine beetle infestations, Northern Region, 1984 Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Close

• 36. [Article] Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report

  Citation × Citation Citation Abstract Copy Title: Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Title: Effect of thinning second-growth ponderosa pine stands on incidence of mountain pine beetle infestation : progress report Author: McGregor, Mark D., United States. Forest Service. Northern Region. State & Private Forestry Close

• 37. [Article] Evaluation of mountain pine beetle infestation, Wolf Mountains, Crow Indian Reservation, Montana, 1973

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle infestation, Wolf Mountains, Crow Indian Reservation, Montana, 1973 Author: McGregor, Mark D., Kohler, Steve, United States. Forest Service. Northern Region. State & Private Forestry Title: Evaluation of mountain pine beetle infestation, Wolf Mountains, Crow Indian Reservation, Montana, 1973 Author: McGregor, Mark D., Kohler, Steve, United States. Forest Service. Northern Region. State & Private Forestry Close

• 38. [Article] Status of mountain pine beetle infestation, Glacier National Park, 1976

  Mountain pine beetle populations began increasing in Glacier National Park in 1970. Numbers of infested trees increased steadily from an average of 12 to 115 per hectare from 1972 to 1976. Total hectares ...

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestation, Glacier National Park, 1976 Author: United States. Forest Service. Northern Region. State & Private Forestry, Oakes, Robert D., Hamel, Dennis R., McGregor, Mark D. Mountain pine beetle populations began increasing in Glacier National Park in 1970. Numbers of infested trees increased steadily from an average of 12 to 115 per hectare from 1972 to 1976. Total hectares of infestation have increased from 445 in 1972 to 40,419 ha in 1976. Predictive equations estimate a cumulative loss of nearly 3 million trees by 1977. Silvicultural practices to reduce the phloem thickness/ tree diameter distribution in stands are the best known management alternatives. But because of the National Park Service policy to permit mortality as part of natural succession, application of these alternatives is not recommended. Title: Status of mountain pine beetle infestation, Glacier National Park, 1976 Author: United States. Forest Service. Northern Region. State & Private Forestry, Oakes, Robert D., Hamel, Dennis R., McGregor, Mark D. Mountain pine beetle populations began increasing in Glacier National Park in 1970. Numbers of infested trees increased steadily from an average of 12 to 115 per hectare from 1972 to 1976. Total hectares of infestation have increased from 445 in 1972 to 40,419 ha in 1976. Predictive equations estimate a cumulative loss of nearly 3 million trees by 1977. Silvicultural practices to reduce the phloem thickness/ tree diameter distribution in stands are the best known management alternatives. But because of the National Park Service policy to permit mortality as part of natural succession, application of these alternatives is not recommended. Close

• 39. [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

• 40. [Article] Status of mountain pine beetle infestations, Yellowstone National Park, Wyoming, 1973

  The mountain pine beetle infestation has been epidemic in lodgepole pine in Yellowstone National Park since 1966. Infestation boundaries have advanced steadily northward and eastward. The infestation now ...

  Citation × Citation Citation Abstract Copy Title: Status of mountain pine beetle infestations, Yellowstone National Park, Wyoming, 1973 Author: McGregor, Mark D., Berg, Malcolm J., Hamel, Dennis R., United States. Forest Service. Northern Region. State & Private Forestry The mountain pine beetle infestation has been epidemic in lodgepole pine in Yellowstone National Park since 1966. Infestation boundaries have advanced steadily northward and eastward. The infestation now encompasses nearly one-half of the total Park area. Surveys indicate a decline in tree mortality the last 2 years. In 1970, an average of 18.9 lodgepole pine was killed per acre. In 1971, 19.0 were killed per acre. In 1972 and 1973, these figures declined to 16.7 and 6.6 trees per acre respectively. Average diameter of attacked trees has decreased from 12.0 inches d.b.h. in 1971 to 10.0 inches d.b.h. in 1973. A decrease in number of infested trees occurred in older infestation centers in the southwest corner of the Park due to depletion of available hosts. Title: Status of mountain pine beetle infestations, Yellowstone National Park, Wyoming, 1973 Author: McGregor, Mark D., Berg, Malcolm J., Hamel, Dennis R., United States. Forest Service. Northern Region. State & Private Forestry The mountain pine beetle infestation has been epidemic in lodgepole pine in Yellowstone National Park since 1966. Infestation boundaries have advanced steadily northward and eastward. The infestation now encompasses nearly one-half of the total Park area. Surveys indicate a decline in tree mortality the last 2 years. In 1970, an average of 18.9 lodgepole pine was killed per acre. In 1971, 19.0 were killed per acre. In 1972 and 1973, these figures declined to 16.7 and 6.6 trees per acre respectively. Average diameter of attacked trees has decreased from 12.0 inches d.b.h. in 1971 to 10.0 inches d.b.h. in 1973. A decrease in number of infested trees occurred in older infestation centers in the southwest corner of the Park due to depletion of available hosts. Close