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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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AHDB Potatoes - PCN (Potato Cyst Nematode)
Agriculture & Horticulture Development Board (United Kingdom).
Aquatic Invasive Species
University of Wisconsin. Sea Grant Institute.
Avian Influenza
UN. FAO. Animal Production and Health Division.
Avian Influenza
DOI. USGS. National Wildlife Health Center.
Provides news updates and other resources
Avian Influenza Portal

World Organisation for Animal Health.
Brown Marmorated Stink Bug
Ontario Ministry of Agriculture, Food, and Rural Affairs (Canada).
Cooperative Islands Initiative
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Department of Entomology

University of Wisconsin - Madison.
Diseases and Control Measures - African Swine Fever
European Commission.
Dutch Elm Disease
Alberta Agriculture and Rural Development (Canada).
Emerald Ash Borer

Natural Resources Canada. Canadian Forest Service.
Emergency Prevention System for Animal Health - African Swine Fever
UN. FAO. Animal Production and Health Division.
Environment - Pests and Weeds
Auckland Council (New Zealand).
Feral Animals in Australia - Feral Pigs
Australian Government. Department of the Environment and Energy.
Firewood Map
Nature Conservancy. Don't Move Firewood.
Provides specific state information on their firewood regulations and recommendations (includes Canada and Mexico).
Galapagos Invasive Species
Hawaiian Ecosystems at Risk; Charles Darwin Foundation; Galapagos National Park; Ecuadorian Agricultural Health Service in Galapagos; Galapagos National Institute.
Global Initiative on Late Blight
Consultative Group on International Agricultural Research.
GloBallast Partnerships Programme
GloBallast Partnerships Programme.
Building Partnerships to Assist Developing Countries to Reduce the Transfer of Harmful Aquatic Organisms in Ships’ Ballast Water, simply referred to as GloBallast Partnerships (GBP), was initiated in late 2007 and is intended to build on the progress made in the original project. This was initially planned as a five-year project, from October 2007 to October 2012, but was extended until June 2017.
Horus Institute of Environmental Development and Conservation
Instituto Hórus de Desenvolvimento e Conservação Ambiental (Horus Institute of Environmental Development and Conservation, Brazil).
Special Note: Site in Portuguese and Spanish
iMapInvasives - Invasive Species Identification Guides

Nature Conservancy. iMapInvasives.

Includes a variety of published guides and internet resources (videos) for use in identifying invasive species that are found in the participating states, provinces, and regions of the iMapInvasives network. The iMapInvasives network is currently comprised of various U.S. states and one Canadian province (Arizona, Florida, Kentucky, Maine, New York, Oregon, Pennsylvania, Vermont, Virginia, and West Virginia, and in Canada - Saskatchewan).