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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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All About Birds - European Starling
Cornell Laboratory of Ornithology.
Note: Nesting Behavior
Animal Diversity Web - Cricetomys gambianus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Lithobates catesbeianus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Myocastor coypus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Neogobius melanostomus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Orconectes rusticus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Piaractus brachypomus
University of Michigan. Museum of Zoology.
Animal Diversity Web - Pterois volitans
University of Michigan. Museum of Zoology.
Animal Diversity Web - Rhinella marina
University of Michigan. Museum of Zoology.
Animal Diversity Web - Sturnus vulgaris
University of Michigan. Museum of Zoology.
Animal Diversity Web - Sus scrofa
University of Michigan. Museum of Zoology.
Animal Diversity Web - Trachemys scripta
University of Michigan. Museum of Zoology.
Annual Plum Pox Virus Survey
Cornell University (New York). New York State Agricultural Experiment Station.
Anthracnose Diseases of Dogwood (PDF | 313 KB)
University of Arkansas. Cooperative Extension Service.
See also: Common Disease Problems for more fact sheets.
Anthracnose of Flowering Dogwood (PDF | 424 KB)
Cornell University. Cooperative Extension of Suffolk County. Horticulture Diagnostic Laboratory.
See also: Tree and Shrub Disease for more fact sheets.
Aquatic Invasive Species

Illinois-Indiana Sea Grant College Program.
Archives of the Center for Invasive Species Management
Montana State University.
The Center for Invasive Species Management closed in 2015. Archives of relevant materials are available here.
Arkansas Invasive Pests
University of Arkansas. Cooperative Extension Service.
Provides information to find out how you can help stop the spread of invasive animals, diseases, insects, and plants.
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.
Asian Soybean Rust (PDF | 405 KB)
University of Arkansas. Cooperative Extension Service.
See also: Field Crop Diseases in Arkansas for more factsheets