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    Author(s): Marcin Jachym
    Date: 2003
    Source: In: McManus, Michael L.; Liebhold, Andrew M., eds. Proceedings: Ecology, Survey and Management of Forest Insects; 2002 September 1-5; Krakow, Poland. Gen. Tech. Rep. NE-311. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station. 145-146.
    Publication Series: Other
    Station: Northeastern Research Station
    PDF: View PDF  (79.63 KB)

    Description

    The web-spinning sawflies (Cephalcia Panz.) are members of the Symphyta that are of economic significance, and which constitutes an integral part of the spruce forest environment. Spruce, which is the dominant component of Western Carpathian forest stands, is the only known host plant for all the species of Cephalcia. Species in this genus occasionally appear in high densities at which time they become a major threat to coniferous forest stands especially in the mountains. Gradations develop very slowly but may persist for several years. Defoliation by these insects causes a reduction in radial increment and weakens trees so that they are susceptible to attack by secondary organisms and by drought. This may result in extensive tree mortality over large areas. Monolithic spruce forest stands of artificial origin are attacked, as are stands of natural origin in middle and older age classes that are located at altitudes of 800-1200m.

    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

    Jachym, Marcin. 2003. Location, evolution and importance of Cephalcia spp. (Hym: Pamphiliidae) populations in Polish Carpathian Mountains. In: McManus, Michael L.; Liebhold, Andrew M., eds. Proceedings: Ecology, Survey and Management of Forest Insects; 2002 September 1-5; Krakow, Poland. Gen. Tech. Rep. NE-311. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station. 145-146.

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