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Tolerance of Winter Wheat to Herbicides is Influenced by Weather Conditions, Growth Stage and Fungicide Tank-mixes

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Title: Tolerance of Winter Wheat to Herbicides is Influenced by Weather Conditions, Growth Stage and Fungicide Tank-mixes
Author: De Jong-Robinson, Melody A
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Tardif, Francois JSikkema, Peter H
Abstract: Field studies were conducted in Ontario in 2009 and 2010 to determine the tolerance of winter wheat to herbicide-fungicide tank-mixtures, and the tolerance of winter wheat underseeded red clover to commonly used herbicides applied at three timings. Tank-mixtures including the fungicide tebuconazole caused injury at early and late timings, while mixtures including the herbicide bromoxynil/MCPA were most injurious when applied late in the season. Injury was transient with no yield reductions observed. MCPA/mecoprop/dicamba caused significant yield reductions when applied at normal and late timings, but did not reduce yield when applied early. The herbicides prosulfuron+bromoxynil and pyrasulfotole/bromoxynil were most injurious to underseeded red clover and reduced clover biomass regardless of application timing. Herbicides and herbicide-fungicide tank-mixtures applied early, during cold temperatures do not increase winter wheat or red clover sensitivity; the likelihood of injury is greatest when applications of these products occur late.
URI: http://hdl.handle.net/10214/3669
Date: 2012-05
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