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• 1. [Article] Evaluation of mountain pine beetle infestation, Hebgen Lake Ranger District, Gallatin National Forest, Montana, 1978

  Mountain pine beetle populations developed to epidemic level in 1970 on the Hebgen Lake Ranger District. Infested acreage increased from 78,000 in 1977 to 79,061 in 1978. More than 4 million trees (238 ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of mountain pine beetle infestation, Hebgen Lake Ranger District, Gallatin National Forest, Montana, 1978 Author: Meyer, Hubert E., United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D., Bennett, D. D. Mountain pine beetle populations developed to epidemic level in 1970 on the Hebgen Lake Ranger District. Infested acreage increased from 78,000 in 1977 to 79,061 in 1978. More than 4 million trees (238 MMBF) were killed in 1978. Cold temperatures during December 1978 may cause a significant decline in the beetle population, resulting in a decline in the number of newly attacked trees in 1979. Potential mortality from the beetle can be reduced and prevented through an accelerated program of (1) logging infested trees, and (2) silvicultural treatment of green and infested stands to reduce the inventory of large diameter highly preferred trees. High valued lodgepole pine in recreation and administrative sites should be sprayed with the preventative chemical, Sevimo1-4, to protect trees from beetle attack until the epidemic declines. Title: Evaluation of mountain pine beetle infestation, Hebgen Lake Ranger District, Gallatin National Forest, Montana, 1978 Author: Meyer, Hubert E., United States. Forest Service. Northern Region. State & Private Forestry, McGregor, Mark D., Bennett, D. D. Mountain pine beetle populations developed to epidemic level in 1970 on the Hebgen Lake Ranger District. Infested acreage increased from 78,000 in 1977 to 79,061 in 1978. More than 4 million trees (238 MMBF) were killed in 1978. Cold temperatures during December 1978 may cause a significant decline in the beetle population, resulting in a decline in the number of newly attacked trees in 1979. Potential mortality from the beetle can be reduced and prevented through an accelerated program of (1) logging infested trees, and (2) silvicultural treatment of green and infested stands to reduce the inventory of large diameter highly preferred trees. High valued lodgepole pine in recreation and administrative sites should be sprayed with the preventative chemical, Sevimo1-4, to protect trees from beetle attack until the epidemic declines. Close

• 2. [Article] Evaluation of Douglas-fir mortality from Douglas-fir beetle from 1982 through 1984 following MCH application

  A granular controlled release formulation of 2 percent MCH was applied at 4.48 kg/ha to 76.9 ha of uninfested, windthrown Douglas-fir by helicopter with a modified aerial spreader of 1.12 m capacity in ...

  Citation × Citation Citation Abstract Copy Title: Evaluation of Douglas-fir mortality from Douglas-fir beetle from 1982 through 1984 following MCH application Author: United States. Forest Service. Northern Region, Meyer, Hubert E., McGregor, Mark D., Oakes, Robert D. A granular controlled release formulation of 2 percent MCH was applied at 4.48 kg/ha to 76.9 ha of uninfested, windthrown Douglas-fir by helicopter with a modified aerial spreader of 1.12 m capacity in May 1982. Douglas-fir beetle population reduction was 96.4 percent by late June. With one exception, treated plots had no successful attacks through 1984. Successfully attacked trees in stands surrounding treated plots declined sharply by the second season. This may indicate MCH dispersed beetles over a wide area preventing the development of many epicenters. Mortality remained high in check areas and surrounding stands. In all areas surrounding treated blocks and check areas, the number of pitchouts increased and average diameter of successfully attacked trees declined with successive years of infestation. This pattern is indicative to that experienced following a beetle population buildup in windthrow in other areas. We recommend MCH be registered at 2 percent controlled release formulation for application to inaccessible windthrown trees, and to protect adjacent high-value stands. Title: Evaluation of Douglas-fir mortality from Douglas-fir beetle from 1982 through 1984 following MCH application Author: United States. Forest Service. Northern Region, Meyer, Hubert E., McGregor, Mark D., Oakes, Robert D. A granular controlled release formulation of 2 percent MCH was applied at 4.48 kg/ha to 76.9 ha of uninfested, windthrown Douglas-fir by helicopter with a modified aerial spreader of 1.12 m capacity in May 1982. Douglas-fir beetle population reduction was 96.4 percent by late June. With one exception, treated plots had no successful attacks through 1984. Successfully attacked trees in stands surrounding treated plots declined sharply by the second season. This may indicate MCH dispersed beetles over a wide area preventing the development of many epicenters. Mortality remained high in check areas and surrounding stands. In all areas surrounding treated blocks and check areas, the number of pitchouts increased and average diameter of successfully attacked trees declined with successive years of infestation. This pattern is indicative to that experienced following a beetle population buildup in windthrow in other areas. We recommend MCH be registered at 2 percent controlled release formulation for application to inaccessible windthrown trees, and to protect adjacent high-value stands. Close