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    Author(s): John S. Hard
    Date: 1974
    Source: Gen. Tech. Rep. PNW-GTR-013. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 39 p
    Publication Series: General Technical Report (GTR)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (624 KB)

    Description

    Southeast Alaska's remaining virgin forests have few insect pests. The black-headed budworm and the hemlock sawfly, both western hemlock defoliators, are the most important species. They kill some trees, kill tops in others, and cause growth loss, but stands survive their attacks. Extensive conversion of virgin stands to second growth may result in an increase in pest problems as it has in similar areas such as coastal British Columbia.

    Widespread use of insecticides to control major outbreaks is not practical because of risk of contaminating salmon-spawning and trout-rearing streams; but insecticide use may be justified in local, high value areas. Weather, diseases, and parasites control outbreaks naturally. Damage-prone stands should be identified and harvested before insect attack or salvage-logged following outbreaks. Ideally, second-growth stands should be managed for resistance to insect pests.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Hard, John S. 1974. The forest ecosystem of southeast Alaska: 2. Forest insects. Gen. Tech. Rep. PNW-GTR-013. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 39 p

    Keywords

    insects, natural control (insects), southeast Alaska, research

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