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U.S. Department of Agriculture
National Invasive Species Information Center

Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.

National Invasive Species Information Center (NISIC)

The gateway to invasive species information; covering federal, state, local and international sources.
Invasive species are plants, animals, or pathogens that are non-native (or alien) to the ecosystem under consideration, and whose introduction causes or is likely to cause harm.

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  • Spotted Knapweed

    Crowds out native species and forage for livestock (Zouhar 2001)

  • Emerald Ash Borer

    Ash trees lose most of their canopy within 2 years of infestation and die within 3-4 years (McCullough and Usborne 2015; Poland and McCullough 2006)

  • Lionfish

    Preys on native species; has venomous spines (Morris and Whitfield 2009)

  • Johnsongrass

    Agricultural weed that can cause serious economic losses (Howard 2004)

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