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    Author(s): Evan Preisser; Alexandra Lodge; David Orwig; Joseph Elkinton
    Date: 2007
    Source: In: Gottschalk, Kurt W., ed. Proceedings, 17th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2006; Gen. Tech. Rep. NRS-P-10. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 80.
    Publication Series: General Technical Report - Proceedings
    Station: Northern Research Station
    PDF: View PDF  (39.72 KB)

    Description

    The elongate hemlock scale Fiorinia externa, (EHS) an invasive pest from Japan, was first found in the eastern United States in 1908. It feeds on a variety of plants, most notably the eastern hemlock Tsuga canadensis, and has been spreading slowly into southern New England. In order to examine the northern spread of EHS and the possibility of local adaptation in this insect, we first performed a field survey in which we resurveyed 141 hemlock stands (first surveyed in 1997-98; see Orwig et al. 2002 for details) in a 7500 km? transect from southern Connecticut to northern Massachusetts.

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    Citation

    Preisser, Evan; Lodge, Alexandra; Orwig, David; Elkinton, Joseph. 2007. Adaptation during northern range expansion in the elongate hemlock scale Fiorinia externa. In: Gottschalk, Kurt W., ed. Proceedings, 17th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2006; Gen. Tech. Rep. NRS-P-10. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 80.

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