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Determining the Fit of Dicamba-Resistant Soybean for Ontario Agriculture

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Title: Determining the Fit of Dicamba-Resistant Soybean for Ontario Agriculture
Author: Underwood, Matthew; Sikkema, Peter; Hooker, David; Robinson, Darren; Swanton, Clarence; Vink, Joe
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Sikkema, PeterHooker, David
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.
URI: http://hdl.handle.net/10214/12130
Date: 2017-12
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