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Glyphosate-resistant Canada fleabane (Conyza canadensis (L.) Cronq.) in Ontario: Distribution and Control in Soybean (Glycine Max (L.) Merr.)

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dc.contributor.advisor Sikkema, Peter H.
dc.contributor.advisor Tardif, François J.
dc.contributor.author Byker, Holly P.
dc.date.accessioned 2013-04-25T19:40:38Z
dc.date.available 2013-04-25T19:40:38Z
dc.date.copyright 2013-04
dc.date.created 2013-03-05
dc.date.issued 2013-04-25
dc.identifier.uri http://hdl.handle.net/10214/6582
dc.description.abstract Canada fleabane is the second glyphosate-resistant (GR) weed species to be confirmed in Ontario. In 2010, GR populations were identified at eight sites in Essex County. In 2011 and 2012, 147 additional sites across eight counties were confirmed to be resistant. Twelve and seven sites were identified with multiple resistance (glyphosate and cloransulam) in 2011 and 2012, respectively, across five counties. In soybeans, preplant tankmixes of glyphosate (900 g a.e.ha-1) plus saflufenacil (25 g a.i. ha-1), saflufenacil/dimethenamid-p (245 g a.i. ha-1), metribuzin (1120 g a.i. ha-1), or flumetsulam (70 g a.i. ha-1) provided greater than 87% up to 8 weeks after application (WAA). Glyphosate rates 21 to 48X the label rate (900 g a.e. ha-1) were required for 95% control. Postemergence tankmixes did not provide acceptable control. In dicamba-tolerant soybean, dicamba applied preplant at 600 g a.e. ha-1 provided the most consistent control of GR Canada fleabane. en_US
dc.description.sponsorship Monsanto Canada Inc., Grain Farmers of Ontario, Agricultural Adaptation Council en_US
dc.language.iso en en_US
dc.subject Canada fleabane en_US
dc.subject glyphosate en_US
dc.subject biologically effective rate of glyphosate en_US
dc.subject resistance en_US
dc.subject multiple resistance en_US
dc.subject cloransulam en_US
dc.subject dicamba en_US
dc.subject soybean en_US
dc.subject survey en_US
dc.subject preplant herbicides en_US
dc.subject postemergence herbicides en_US
dc.title Glyphosate-resistant Canada fleabane (Conyza canadensis (L.) Cronq.) in Ontario: Distribution and Control in Soybean (Glycine Max (L.) Merr.) en_US
dc.type Thesis en_US
dc.degree.programme Plant Agriculture en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Plant Agriculture en_US


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