Herbicide resistant weed testing: University of Guelph lab results, 2013

Below is a summary of all weed samples sent into the University of Guelph by producers and agronomists that suspected resistance to a particular herbicide during the 2012 season. Also included are herbicide options with different modes of action that are effective on each species. The latest summary of glyphosate resistant Canada fleabane and Giant ragweed populations is also listed. Note that these are cumulative maps of the last 3-4 years, whereas the other species are just for this past year.

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Populations of Canada fleabane resistant to glyphosate.
Source: Dr. Peter Sikkema and Holly Byker, University of Guelph, Ridgetown Campus
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Populations of Giant ragweed resistant to glyphosate.
Source: Dr. Peter Sikkema and Joanna Follings, University of Guelph, Ridgetown Campus

If you suspect you have a herbicide resistant weed population, you can get it tested. More information can be found here.

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