International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
PowerPoint Charts Available for Download
High resolution PowerPoint charts available for presentations and extension publications, 2019. The PowerPoint contains charts made in Excel. WSSA version (WSSA Group Numbers) and HRAC version (HRAC Group Letters) . PowerPoint Charts
Resistance Status in France.
R4P Network
Dr. Christophe Délye from the French National Institute for Agricultural Research (INRA) has provided information on herbicide-resistant weeds in France....... en anglais!
 Resistance Lists of Cases Identified in France to Registered and Formerly Registered Molecules
International Survey of Herbicide Resistant Weeds
Friday, November 22, 2019
There are currently 509 unique cases (species x site of action) of herbicide resistant weeds globally, with 262 species (152 dicots and 110 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 93 crops in 70 countries. The website has 2834 registered users and 606 weed scientists have contributed new cases of herbicide resistant weeds. View Recent Additions, Site of Action Summary, or the Herbicide Classification System.

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About This 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.
Genomic DNA Sequences that Encode for Herbicide Targets
Darci Giacomini has created this database to (1) give quick access to the most common herbicide resistance genes across a wide range of weedy species and (2) provide a resource for researchers interested in discovering these gene sequences from weed species not listed here. Click here to go to the Sequence Database
Guidelines for Minimizing the Risk of Glyphosate Resistance in the UK.
WRAG (UK Weed Resistance Action Group) has done a great job developing these guidelines, you can download them here:
 Guidelines for Minimizing the Risk of Glyphosate Resistance in the UK.
 Glyphosate Mutation Database - Dr. Todd Gaines.
Dr. Todd Gaines has compiled a list of weeds with mutations that confer resistance glyphosate Click Here.
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, November 22, 2019 .  Available  www.weedscience.org
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