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• 1. [Article] A three year evaluation of Douglas-fir cone and seed insects in Montana and Yellowstone National Park

  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 ...

  Citation × Citation Citation Abstract Copy Title: A three year evaluation of Douglas-fir cone and seed insects in Montana and Yellowstone National Park Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry 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 41 sound seeds could be found. Title: A three year evaluation of Douglas-fir cone and seed insects in Montana and Yellowstone National Park Author: Dewey, Jerald E., United States. Forest Service. Northern Region. State & Private Forestry 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 41 sound seeds could be found. Close