There are currently
498 unique cases (species x site of action) of herbicide resistant weeds globally, with
255 species (148 dicots and 107 monocots). Weeds have evolved resistance to
23 of the 26 known herbicide sites of action and to 166 different herbicides. Herbicide resistant weeds have been reported in
92 crops in 70 countries. The website has 2732 registered users and 571 weed scientists have contributed new cases of herbicide resistant weeds. View
Recent Additions,
Site of Action Summary, or the
Herbicide Classification System.