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A three year evaluation of Douglas-fir cone and seed insects in Montana and Yellowstone National Park Public Deposited
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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.
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