The mountain pine beetle, Dendroctonus ponderosae Hopk., infestation in Yellowstone National Park advanced north and eastward in 1974. New infestation centers were located along the east shore of Yellowstone Lake and south of the Promontory to the Park's southern boundary. Ground surveys indicated an average of 2.9 infested trees per acre. Average diameter of attacked trees was 11.0 inches. A decrease in number of infested trees continues to occur in older portions of the infestation in the southwestern corner of the Park. The outbreak has been declining since 1971 and the 1974 survey indicates a continued decline.
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