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
New : Filter Resistant Weeds by Multiple Factors.
You can now use multiple factors (Weed Species, Crops, Country, US State, Herbicide Groups, and Individual Herbicides) to filter the data. Click Here to go to the Filter Page
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
Wednesday, December 4, 2024
There are currently 533 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 101 crops in 72 countries. The website has 3342 registered users and 712 weed scientists have contributed new cases of herbicide resistant weeds. View Recent Additions, Site of Action Summary, or the Herbicide Classification System.

SELECT LISTS OF HERBICIDE-RESISTANT WEEDS BY ONE OF THE BELOW
 
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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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, December 4, 2024 .  Available  www.weedscience.org
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