INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Current Status of the International Herbicide-Resistant Weed Database

Friday, January 27, 2023

There are currently 515 unique cases (species x site of action) of herbicide resistant weeds globally, with 267 species (154 dicots and 113 monocots). Weeds have evolved resistance to 21 of the 31 known herbicide sites of action and to 165 different herbicides. Herbicide resistant weeds have been reported in 98 crops in 72 countries. The website has 3176 registered users and 667 weed scientists have contributed new cases of herbicide resistant weeds. View Recent Additions, Site of Action Summary, or the Herbicide Classification System.

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Friday, January 27, 2023 .  Available  www.weedscience.org Copyright © 1993- 2023 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.