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Determining the Fit of Dicamba-Resistant Soybean for Ontario Agriculture

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dc.contributor.advisor Sikkema, Peter
dc.contributor.advisor Hooker, David Underwood, Matthew Sikkema, Peter Hooker, David Robinson, Darren Swanton, Clarence Vink, Joe 2018-01-03T19:23:58Z 2018-01-03T19:23:58Z 2017-12 2017-12-14 2018-01-03
dc.description.abstract Prior to the launch of Roundup Ready Xtend soybean, a genetically modified soybean with transgenes that express resistance to glyphosate and dicamba, several knowledge gaps existed regarding weed control, tank-mix compatibility, profitability, and environmental impact. The addition of dicamba (300 or 600 g ae ha-1) to quizalofop-p-ethyl (24, 30, or 36 g ai ha-1) or clethodim (30, 37.5 or 45 g ai ha-1), applied postemergence (POST), reduced the control of glyphosate-resistant volunteer corn by 11 to 20%, however, the antagonism could be overcome by increasing the rate of graminicide 25-50%. The addition of dicamba (600 g ae ha-1) to glyphosate (900 g ae ha-1), applied POST, increased broadleaf weed control by 3 to 14% 8 weeks after application (WAA). Dicamba, applied POST, provided poor control of grasses resulting in soybean seed yield loss of 30 to 33% compared to dicamba plus glyphosate. When applied preemergence (PRE) in a conventional tillage production system, dicamba (600 g ae ha-1) provided similar control of annual broadleaf weeds compared to several industry standards. Dicamba provided poorer broadleaf weeds in no-till production systems than several pre-plant (PP) herbicides which provided good to excellent control of broadleaf and grass weed species. The reduced broadleaf weed control with dicamba was likely due to the short residual activity in the soil. en_US
dc.description.sponsorship Grain Farmers of Ontario, Growing Forward 2, Monsanto Canada en_US
dc.language.iso en en_US
dc.subject Herbicide en_US
dc.subject Dicamba en_US
dc.subject Glyphosate en_US
dc.subject Soybean en_US
dc.subject Antagonism en_US
dc.subject Weed Control en_US
dc.subject Dicamba-Resistant en_US
dc.subject Glyphosate-Resistant en_US
dc.subject Tank-mix en_US
dc.title Determining the Fit of Dicamba-Resistant Soybean for Ontario Agriculture en_US
dc.type Thesis en_US Plant Agriculture en_US Master of Science en_US Department of Plant Agriculture en_US
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