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

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University of Maryland. Cooperative Extension. Home and Garden Information Center.
Have a plant or pest question? Questions from Maryland and the District of Columbia are answered by Home and Garden Information Center’s Certified Professional Horticulturists. If you are located outside of these areas, you will be asked to enter your state and county. Your question will be forwarded to the appropriate extension expert.
New York Invasive Species Research Institute - Expert Database
Cornell University. College of Agriculture and Life Sciences.