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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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Arkansas Plant Diseases Database
University of Arkansas. Cooperative Extension Service.
The collection of digital images is provided as a service to Arkansas agriculture. These images represent symptoms of both pathological (infectious) and non-pathological (physiological/environmental) disorders of agronomic row crops and horticultural crops that grow in Arkansas. These photos are useful as an identification tool to growers of the crops listed.
Early Detection & Distribution Mapping System (EDDMapS)
University of Georgia. Center for Invasive Species and Ecosystem Health.
Early Detection and Distribution Mapping System (EDDMapS), provides a more accurate picture of the distribution of invasive species. EDDMapS will allow land managers, agencies and others to set priorities for early detection and rapid response (EDRR), as well as formulate overall invasive plant management action plans. Includes distribution data by species and by county.
Invasive Plant Atlas of New England (IPANE)

University of Georgia. Center for Invasive Species and Ecosystem Health.