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Creator:: Dewey, Jerald E. and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: A 3-year evaluation of Douglas-fir cones in Montana and Yellowstone National Park, Wyoming, showed the western spruce budworm, Choristoneura occidentalis Freeman, and midges were the most common and injurious insects found each year. Injury was so severe at some plots that no sound seeds could be found.
Resource Type:: Technical Report
Full Text:: Evaluation of no.72-1 ;LAS-FIR CONE AND SEED INSECTS itana and Yellowstone National Park • I U. S

Creator:: McGregor, Mark D., Berg, Malcolm J., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: The mountain pine beetle, Dendroctonus ponderosae Hopk., infestation advanced north and eastward from the 1971 infestation boundary in Yellowstone National Park. Infested trees were found in Indian Creek Campground at the north end of the park and around the north end of Yellowstone Lake. A ground survey showed an average...
Resource Type:: Technical Report
Full Text:: inches and larger in diameter during the past 3 years in some areas of Yellowstone 41 National Park

Creator:: Berg, Malcolm J., McGregor, Mark D., and United States. Forest Service. Northern Region. State & Private Forestry
Abstract:: The mountain pine beetle, Dendroctonus ponderosas Hopk., showed a significant advance northward from the 1970 infestation boundary, encompassing almost one-third of the total Park acreage. A fall survey conducted in the Park showed an average of 71.1 trees per acre with red or fading foliage from previous year's attacks and...
Resource Type:: Technical Report
Full Text:: YELLOWSTONE NATIONAL PARK, WYOMING, 1971 by Malcolm J. Berg1/ and Mark D. McGregor/2- ABSTRACT The

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