Northern Research Station

Title: Using dendrochronology to model hemlock woolly adelgid effects on eastern hemlock growth and vulnerability

Author: Rentch, James; Fajvan, Mary Ann; Evans, Richard A.; Onken, Brad.

Date: 2009

Source: Biological Invasions. 11: 551-563.

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.

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

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Citation

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