Thursday, November 19, 2020

Update on Lake George Hemlock Woolly Adelgid Treatment

The New York State Department of Environmental Conservation (DEC) and its partners have successfully completed this year’s Hemlock Woolly Adelgid (HWA) spread prevention and control treatment on the Washington County Forest Preserve Lands.

This treatment is part of an ongoing effort spanning multiple years. The HWA infestation was confirmed by the DEA in August- the affected hemlock trees located within the Glen Island Campground on the shore of Lake George.



Click the following links to view DEC footage taken during the fall treatment efforts:

The DEC, Cornell’s New York State Hemlock Initiative, the Adirondack Park Invasive Plant Program (APIPP), and the Lake George Land Conservancy staff spent approximately 100 working days surveying the initially reported infestation. They began treatment on October 6th over a three-week time period by the DEC’s Division of Lands and Forests. DEC crews from across the state were supported by partners from Capital District/Mohawk Partnership for Regional Invasive Species Management and APIPP.

In total, 275 working days were spent during the treatment period covering 138 high priority acres. 2,500 hemlock trees were treated for HWA with imidacloprid (a long lasting pesticide) and dinotefuran (a quick acting pesticide) in order to kill any active HWA and prevent another infestation. 80 trees in sensitive locations were treated via direct injection in order to reduce impacts on non-target species, and to the watershed in general. 620 Laricobius bettles, which feed on adelgids, were also released in an effort to introduce bilogicial control modules.

Early detection and rapid response to invasive pests is central to protecting New York’s natural resources. DEC and its partners’ efforts to further prevent the spread of HWA are critical to protecting the hemlock forests in the Lake George watershed and greater Adirondack Park.

Signs of HWA on hemlock trees include white woolly masses (ovisacs) about one-quarter the size of a cotton swab on the underside of branches at the base of needles, gray-tinted foliage, and needle loss. DEC is asking the public to report signs of HWA:

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Information attributed to NYSDEC is taken from press releases and news announcements from New York State's Department of Environmental Conservation.

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