General InformationNational Invasive Species Information Center
USDA, National Agricultural Library
Gateway to invasive species information; covering Federal, State, local, and International sources.
National Invasive Species Council
For policy questions contact the National Invasive Species Council, an inter-Departmental council that helps to coordinate and ensure complementary, cost-efficient and effective Federal activities regarding invasive species.
Consult an expert before removing trees.
Think your trees are infested with an invasive insect or pathogen? Consult an expert before taking action. Contact your local extension office or a href="http://www.isa-arbor.com/findanarborist/findanarborist.aspx" target="new">find an arborist for verification before removing or treating your trees.
AgNIC, Systematic Entomology
North Carolina State University
Guide to insect systematic resources. The site includes general information; links to insect collections; identification tools; organizations; and educational resources.
100 of the World's Worst Invasive Alien Species
ICUN, Invasive Species Specialist Group
A selection of alien species illustrating the variety of species capable of establishing and dominating new places. The species were selected from the Global Invasive Species Database,
Insect Species Not Established in the United States
USDA, National Agricultural Library, National Invasive Species Information Center
A select list of species of concern, providing examples of the need to increase efforts in early detection and rapid response, for the prevention of new introductions.