International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
International Survey of Herbicide Resistant Weeds
Thursday, October 23, 2014
There are currently 437 unique cases (species x site of action) of herbicide resistant weeds globally, with 238 species (138 dicots and 100 monocots). Weeds have evolved resistance to 22 of the 25 known herbicide sites of action and to 155 different herbicides. Herbicide resistant weeds have been reported in 84 crops in 65 countries. There website has 1929 registered users and 441 weed scientists have contributed new cases of herbicide resistant weeds. View Recent Additions, Site of Action Summary, or the Herbicide Classification System.

About the Survey
The purpose of this survey is to monitor the evolution of herbicide-resistant weeds and assess their impact throughout the world. The site is a global collaboration between weed scientists with a common goal of understanding, preventing and managing the occurrence of herbicide-resistant weeds.
 Glyphosate Mutation Database - Dr. Todd Gains.
Dr. Todd Gains has compiled a list of weeds with mutations that confer resistance glyphosate Click Here.
PowerPoint Charts Available for Download
High resolution PowerPoint charts available for presentations and extension publications. The PowerPoint contains charts made in Excel. Data from May 18th, 2014. WSSA version (WSSA Group Numbers) and HRAC version (HRAC Group Letters) . PowerPoint Charts
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, October 23, 2014 .  Available  www.weedscience.org
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