There are currently
541 unique cases (species x site of action) of herbicide resistant weeds globally, with
273 species (156 dicots and 117 monocots). Weeds have evolved resistance to
21 of the 31 known herbicide sites of action and to 168 different herbicides. Herbicide resistant weeds have been reported in
102 crops in 75 countries. The website has 3461 registered users and 755 weed scientists have contributed new cases of herbicide resistant weeds. View
Recent Additions,
Site of Action Summary, or the
Herbicide Classification System.