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    Author(s): David D. Morton; John A. Young; Nissa M. Thomsen
    Date: 2000
    Source: In: McManus, Katherine A.; Shields, Kathleen S.; Souto, Dennis R., eds. Proceedings: Symposium on sustainable management of hemlock ecosystems in eastern North America. Gen. Tech. Rep. NE-267. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 189.
    Publication Series: General Technical Report (GTR)
    Station: Northeastern Research Station
    PDF: View PDF  (45.31 KB)

    Description

    Hemlock woolly adelgid (HWA) was first observed in Shenandoah National Park (SNP) in the mid-1980s. Since then, this exotic insect has expanded its range throughout the park. Most stands were heavily defoliated within several years of infestation. However, several hemlock stands appear to be not affected or only moderately affected to the present date. To investigate this discrepancy in hemlock stand condition, we are analyzing satellite imagery from 1984, 1988-9, 1991-2, 1994, and 1997.

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    Citation

    Morton, David D.; Young, John A.; Thomsen, Nissa M. 2000. Use of multi-date Landsat TM imagery to map eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park. In: McManus, Katherine A.; Shields, Kathleen S.; Souto, Dennis R., eds. Proceedings: Symposium on sustainable management of hemlock ecosystems in eastern North America. Gen. Tech. Rep. NE-267. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 189.

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