- Weed Science Society of America - Publishers of Weed Technology. Weed Technology includes original research on weed biology and control, weed and crop management systems, reports of new weed problems.
- International Parthenium Research News Group - Resources on this noxious weed for scientists and researchers. Includes a news group, picture gallery, scientists directory, references and links.
- Harney County Noxious Weedboard - Information and advice on noxious weeds and their control in Southeastern Oregon.
- Weed Research and Information Center - An interdisciplinary collaboration that fosters research in Weed Management and facilitates distribution of associated knowledge for the benefit of agriculture and for the preservation of natural resources.
- Integrated Weed Control - Biological products and consulting services for weed management. Montana.
- California Noxious Weed Control Projects Inventory - A combined government/private/non-profit effort to establish a database, accessible through the Internet, containing information on noxious weed control in California. This information will further the practice and science of noxious weed control and assi
- Environmental Weeds Action Network (EWAN) - A community initiative to tackle the problem of environmental weeds in bushland and waterways in Australia.
- Environmental Weeds in Australia - Brief introduction to some major environmental weeds in Australia, with photos.
- King County Noxious Weed List - Weed identification in Washington State, USA.
- Suppression of Smooth Brome - Examines the effectiveness of chemical and non-chemical treatments in reducing smooth brome tiller density at Pipestone National Monument, Minnesota.
- National Weeds Strategy - Weeds of National Significance - Australian site promoting key weed policies, regulations, current issues, national initiatives, research, extension training and personnel.
- International Survey of Herbicide Resistant Weeds - Information about weeds and their identification, control and herbicide resistance. A global collaborative effort.
- Positions in Weed Science (WeedJobs) - Advertises permanent, term, postdoctoral and graduate student positions in weed science.
- Weed Identification - Key and species accounts for 172 species from the University of Illinois.
- Virginia Tech Weed Identification Guide - Images and descriptions of many species of terrestrial and aquatic weeds in Virginia.
- Iowa State Weed Science - Detailed information and articles covering all aspects of agricultural weed science.
- New Jersey Agricultural Weed Gallery - Includes brief details, and photographs of the important weeds of NE United States.
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