Glyphosate-resistant Kochia (Kochia scoparia) in Saskatchewan

Researcher: Hugh J. Beckie, Scott W. Shirriff, Chris Lozinski, Agriculture and Agri-Food Canada (AAFC) Saskatoon SK, Eric N. Johnson, Greg Ford, AAFC Scott SK, Christian J. Willenborg, University of Saskatchewan, Saskatoon SK, Clark A. Brenzil, Saskatchewan Ministry of Agriculture, Regina SK

Project Code: CARP-SCDC 2013-1

Final Report: June 2014

Summary: Glyphosate is the most widely used herbicide in the world, and frequent glyphosate use has selected for glyphosate-resistant (GR weeds). In 2011 and 2012, surveys documented the occurrence of GR kochia in Alberta. In the fall of 2013, a survey was conducted across southern and central regions of Saskatchewan to determine the distribution and abundance of GR kochia. Screening confirmed 17 GR kochia populations in nine municipalities in west-central or central Saskatchewan, bringing the total to 14 municipalities in Saskatchewan. The agronomic and economic impact of this GR weed biotype is compounded because of consistent multiple resistance to acetolactate synthase-inhibiting herbicides. However, all GR kochia in Saskatchewan were susceptible to dicamba. Across the prairies, multiple-resistant weeds will continue to challenge growers, especially when one of those sites of action is glyphosate.

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