International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
PowerPoint Charts Available for Download - Uploaded March 18th
High resolution PowerPoint charts available for presentations and extension publications. The PowerPoint contains charts made in Excel from data accessed on March 18th, 2014. WSSA version (WSSA Group Numbers) and HRAC version (HRAC Group Letters) . PowerPoint Charts
 2,200 New Herbicide Resistance Abstracts Added - March 18th
The site now contains over 5,000 scientific abstracts on herbicide resistant weeds.  We aim to link these abstracts to the specific cases of resistance listed on the site. To search the abstract database Click Here.
International Survey of Herbicide Resistant Weeds
Saturday, April 19, 2014
There are currently 429 unique cases (species x site of action) of herbicide resistant weeds globally, with 234 species (138 dicots and 96 monocots). Weeds have evolved resistance to 22 of the 25 known herbicide sites of action and to 154 different herbicides. Herbicide resistant weeds have been reported in 81 crops in 65 countries. There website has 1829 registered users and 433 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.
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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.  Saturday, April 19, 2014 .  Available  www.weedscience.org
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