– Texas Weed Information Group
- Weed Science Organizations
– Weed Science Society of America
– Southern Weed Science Society
– Western Society of Weed Science
– North Central Weed Science Society
– North Eastern Weed Science Society
- Herbicide Label Sites
- Weed ID Sites
– TAMU Vasular Plant Image Gallery
– Weeds of North Central States
– Virginia Tech Weed ID
– Iowa State Weed ID
– Oregon State Weed ID
– California Weed ID
– Missouri Weed ID
– New Jersey Weed ID
– BASF Weed ID
– Midwestern Turf Weed ID
– Agriliance Weed ID
– New Mexico State University – Weed Information - University Weed Science Sites
– Georgia Weed Science
– Iowa State Weed Science
– Oklahoma State Weed Science
– Illinois Weed Science
– Missouri Weed Science - Other Weed Science Sites
– Weedalert.com
– Compendium of Herbicide Adjuvants
– Compendium of Pesticide Common Names
– Herbicide Resistance Action Committee
– International Survey of Herbicide Resistant Weeds
– History of Herbicides - Ag Chemical Sites
– Agri Star
– Agriliance
– Arysta
– BASF
– Bayer CropScience
– Becker Underwood
– Cheminova
– Crompton Crop Protection
– Dow AgroSciences
– Drexel Chemical
– DuPont Crop Protection
– EDEN Bioscience
– Estes
– FarmSaver.com
– FMC
– Goodpasture
– Gowan
– Gustafson
– Helena
– Makhteshim Agan
– Micro Flo
– Monsanto
– Nichino America, Inc.
– Nufarm Ag
– Nufarm Turf & Specialty
– PBI-Gordon
– Sipcam Agro
– Syngenta U.S.
– United Agri Products
– United Phosphorus Limited (Cerexagri)
– Valent
– Wilbur-Ellis