There are currently
515 unique cases (species x site of action) of herbicide resistant weeds globally, with
263 species (152 dicots and 111 monocots). Weeds have evolved resistance to
23 of the 26 known herbicide sites of action and to 167 different herbicides. Herbicide resistant weeds have been reported in
94 crops in 71 countries. The website has 3002 registered users and 632 weed scientists have contributed new cases of herbicide resistant weeds. View
Recent Additions,
Site of Action Summary, or the
Herbicide Classification System.