Soybean School: Glyphosate-Resistant Weeds on the Rise


If you’ve noticed more than a few fleabane “escapes” in recent years, you’re not alone. Glyphosate resistant Canada fleabane has spread across more than 700 kilometers of Ontario crop land in just five years.

Despite its incredible distribution, Canada fleabane wasn’t the first glyphosate resistant weed found in Ontario, says Dr. Peter Sikkema, field crop weed management associate professor with the University of Guelph-Ridgetown in the Soybean School below. The the extent of problem is the real kicker when trying to manage this weed. From an initial eight confirmed fields in 2010, this biotype is confirmed from Essex county to Glengarry county.

Check out several videos on managing glyphosate resistant fleabane here

Canada fleabane is one of four confirmed glyphosate resistant species, says Sikkema. Giant ragweed was confirmed in 2008, common ragweed in 2011, and waterhemp just last year, in 2014.

What can farmers do now, this fall and in the coming years to preserve the glyphosate technology and manage herbicide resistant weeds? Where does the coming dicamba-tolerance trait fit into a management system? RealAgriculture’s Bernard Tobin asks that question and more, and digs in to what factors go in to a fully-integrated weed and resistance management plan.

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Soybean School (view all)Season 4 (2015) Episode 12

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