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Annual Weed Control in Isoxaflutole-Resistant Soybean

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Title: Annual Weed Control in Isoxaflutole-Resistant Soybean
Author: Smith, Andrea
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Sikkema, PeterRobinson, Darren
Abstract: Thirty field trials were conducted over a two-year period (2017 and 2018) at five locations to evaluate the interactions of three rates of isoxaflutole + metribuzin, the efficacy of one-, two-, and three-way herbicide tank-mixtures, and one- and two-pass herbicide programs on ten annual broadleaf and grass weed species in isoxaflutole-resistant soybean. The co-application of isoxaflutole + metribuzin provided similar or greater control of all weed species compared to the herbicides applied alone. Isoxaflutole + metribuzin had additive or synergistic control of weed species evaluated. The addition of a soil applied grass herbicide to isoxaflutole + metribuzin did not improve weed control compared to isoxaflutole + metribuzin. Isoxaflutole + metribuzin followed by glyphosate provided 98-100% control of weed species evaluated. Weed control efficacy of herbicides applied preemergence was influenced by rainfall after application. Annual weeds can be effectively controlled in isoxaflutole-resistant soybean using multiple different weed management strategies.
Date: 2019-02-08
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