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Status of mountain pine beetle infestations, Glacier National Park and Glacier View Ranger District, Flathead National Forest, Montana, 1977

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  • Mountain pine beetle populations developed to epidemic level in Glacier National Park in 1972. Buildup ratio of old to newly attacked trees was 1:1.8 from 1976 to 1977. More than 12 million trees are infested on 142,871 acres. Buildup ratio is expected to exceed 1:3 from 1977 to 1978. Management with fire is recommended to reduce potential hazard and to create a mosaic of young stands within the extensive areas of large timber. In high use areas, all green lodgepole pine 7 inches d.b.h. and larger which are to be retained should be treated with the protective spray Sevimol-4®. Hazard trees should be removed. More than 1.5 million trees are infested on about 27,000 acres on the Glacier View Ranger District. Buildup ratio from 1976 to 1977 exceeded 1:5, and is expected to exceed 1:5 from 1977 to 1978. An accelerated program of logging infested and high risk trees is recommended for high hazard stands. Silvicultural methods for management of various stands are discussed.
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