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Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia trifida L.) in Winter Wheat and Soybean

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Title: Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia trifida L.) in Winter Wheat and Soybean
Author: Quinn, Jessica E.
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Sikkema, Peter H.Robinson, Darren E.
Abstract: The new herbicide halauxifen-methyl was evaluated for the control of glyphosate-resistant (GR) Canada fleabane and giant ragweed in winter wheat and soybean, and the tolerance of corn and soybean to halauxifen-methyl. Halauxifen-methyl applied alone or in a tankmix controlled GR Canada fleabane in winter wheat, while a tankmix partner was required to provide control in soybean. Halauxifen-methyl applied alone did not control GR giant ragweed in winter wheat or soybean, however, when applied in a tankmix, control was achieved. Halauxifen-methyl applied preplant and pre-emergence at 5 g ai ha-1 and 10 g ai ha-1 was safe in corn however yield was reduced when applied early postemergence at the 10 g ai ha-1 rate. Soybean was extremely sensitive to halauxifen-methyl applied early postemergence at both rates, however minimal injury was observed when either rate was applied preplant and pre-emergence. Halauxifen-methyl could provide an effective solution for the control of GR weeds in corn, soybean and winter wheat.
URI: http://hdl.handle.net/10214/17704
Date: 2019-12
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