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    Description

    This study examined the relationship between eastern hemlock (Tsuga canadensis (L.) Carr.) crown condition and changes in radial growth associated with infestation by hemlock woolly adelgid Adelges tsugae (Homoptera: Adelgidae) (HWA). Tree-ring chronologies of eastern hemlock were used to develop a binomial decline index based on three consecutive years of below average growth. Radial growth decline was modeled, using logistic regression, as a function of an extensive array of tree, crown, and site variables that were collected over an 11 year period in Delaware Water Gap National Recreation Area.

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    Citation

    Rentch, James; Fajvan, Mary Ann; Evans, Richard A.; Onken, Bradley. 2009. Using dendrochronology to model hemlock woolly adelgid effects on eastern hemlock growth and vulnerability. Biological Invasions 11:551-563

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    Keywords

    Hemlock woolly adelgid, Adelges tsugae, Tsuga Canadensis, dendrochronology, multiple logistic model, hemlock decline

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https://www.fs.usda.gov/treesearch/pubs/34494