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Beetles, silver flies may help save local forests

Posted 10/5/22

Hemlock trees across a large swath of upstate New York — including Lewis, Oneida, Oswego, Jefferson and St. Lawrence counties – are threatened by an invasive insect.

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Beetles, silver flies may help save local forests

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Hemlock trees across a large swath of upstate New York — including Lewis, Oneida, Oswego, Jefferson and St. Lawrence counties – are being threatened by an invasive insect called the hemlock woolly adelgid.

Only the size of a sesame seed, this tiny aphid-like insect has the ability to take down an entire forest by feeding on and weakening hemlock trees — causing the trees to die within 5 to 7 years if left untreated.

As a foundation species, hemlocks are an important component of our forests and provide many beneficial ecological services, like filtering water, shading streams, and providing food and habitat for wildlife, according to an announcement by researchers with the St. Lawrence Eastern Lake Ontario Partnership for Regional Invasive Species Management (SLELO PRISM).

First detected in New York in the 1980s, the hemlock woolly adelgid is established in the Capital Region, the Catskill Mountains, the Finger Lakes Region, and Western New York.

In 2017, the invasive pest was discovered in Adirondack Park at Prospect Mountain in Lake George, and in 2021, it was discovered in Oswego County. 

Hope for the hemlocks may come in the form of a predatory beetle, Laricobius nigrinus, and two silver fly species,  Leucotaraxis argenticollis, and Leucotaraxis piniperda, which are biocontrol agents or natural predators of the hemlock wooly adelgid from their native range. 

Through a collaboration with the New York State Hemlock Initiative, the state Department of Environmental Conservation, the state Office of Parks Recreation and Historical Preservation, Oswego County, the USDA Forest Service, and SLELO PRISM, the first HWA biocontrol release to take place in the Eastern Lake Ontario region will occur this month. 

A total of 2000 L. nigrinus beetles will be released this October at the Mexico Point State Park, a 122-acre park on the eastern shore of Lake Ontario in Oswego County. These predators feed on HWA eggs, and adults, and over time they have the ability to suppress hemlock woolly adelgid and enhance the resiliency of our hemlock trees.

When predators establish this release has promise to serve as a dispersal point for the Eastern Lake Ontario region, spreading to other important ecosystems in the area to combat HWA regionally.

To learn more about the research being done with the biocontrol agents for hemlock woolly adelgid search for the New York State Hemlock Initiative online. Follow the Hemlock Initiative and SLELO PRISM on Facebook, Instagram, and YouTube to get updates about this story and other initiatives.

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