Garlic mustard (Alliaria petiolata) is invasive through much of the Northeast.
Image by Sandy Repp

Garlic mustard (Alliaria petiolata) is invasive through much of the Northeast.

Brown Marmorated Stink Bug

Deer Tick

What is invasive species?

According to National Invasive Species Management Plan, an invasive species is "a species that is non-native to the ecosystem under consideration and whose introduction causes or is likely to cause economic or environmental harm or harm to human health." This definition was adopted by the NYS Invasive Species Task Force. The Task Force refined the definition stating that to be considered "invasive", a non-native species‛ harm must significantly outweigh any benefits. The NYS Invasive Species Task Force website also provides descriptions of priority invasive species in the area.

  If you have any questions about invasive species locally or if you think you have an invasive species to identify or report, please contact David Gray Cox at dgc23@cornell.edu or (518) 234-4303 or 296-8310.

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Emerald Ash Borer

Learn how to identify the Emerald Ash Borer, monitor your Ash trees, detect and report possible EAB in your trees, and more, with resources we've compiled on this site.

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Hemlock wooly adelgid

Hemlock Pest

The Hemlock Woolly Adelgid lives and feeds on hemlock trees. Infested trees can die within 2 years, although 10-12 years is more common.

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Black swallowwort

Swallow Wort

Areas that have been cleared of swallow-wort should be planted with rapid-growing native species to avoid introduction of other invasive plants.

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Giant Hogweed

Giant hogweed is one of New York's most striking and dangerous invasive plants. Learn how to recognize and manage it safely on our site.

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Last updated June 19, 2014