Photo by Mark Whitmore

Hemlock Woolly Adelgid (HWA) is an aggressive, devastating invasive insect that kills a host tree in a few years. Our eastern hemlocks, which have little or no resistance to these infestations, have been hit hard by HWA in many areas south of the Adirondacks. In the Adirondack and Catskill Parks there are significant hemlock communities.

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