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National Invasive Species Information Center
U.S. Department of Agriculture
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Invasive Species Not Established in U.S.

Provides examples of Invasive Species Not Established in U.S.  Established species are species having a self-sustaining and reproducing population in a specified geographic area without the need for human intervention. Applies to both native and non-native species (Source: Invasive Species Terminology: Standardizing for Stakeholder Education, The Journal of Extension).

These species of concern are why we must increase our efforts in early detection and rapid response (EDRR) and the prevention of new introductions.

See also: Pests not known to occur in the United States or of limited distribution (Invasive.org; USDA, APHIS)