DEC Update on Hemlock Woolly Adelgid Treatment

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finger pointing to hwa infestation

Photo © NYS DEC

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Collaborative Efforts Underway to Help Prevent HWA’s Spread in Region

The New York State Department of Environmental Conservation (DEC) and partners have completed this year’s treatment to control and prevent the spread of Hemlock Woolly Adelgid (HWA). DEC confirmed the HWA infestation in August.

Approximately 2,500 hemlock trees were treated to kill any present HWA and protect from any future infestations.

DEC footage taken during the fall treatment efforts are available here:

Trees were treated with both imidacloprid (long lasting) and dinotefuran (quick acting) pesticides and were primarily treated with a targeted basal bark spray application to limit any impacts to non-target species.

Additionally, 80 trees in sensitive locations were treated by a direct injection method to further reduce impacts on non-target species and to the watershed.

As part of a biological control effort to combat HWA within the infestation area, DEC partners at the New York State Hemlock Initiative released 620 Laricobius beetles, which feed on adelgids.

  • Full DEC Press Release

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