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Advances in Crop Science and Technology

.: Home > Advances in Crop Science and Technology > 2016 > Volume 4 Number 1 > Clay E. Starkey, Jason K. Norsworthy and Lauren M. Schwartz*

Use of HPPD-inhibiting Herbicides for Control of Troublesome Weeds in the Midsouthern United States

Clay E. Starkey, Jason K. Norsworthy and Lauren M. Schwartz*
Department of Crop, Soils, and Environmental Sciences, University of Arkansas,1366 West Altheimer Drive, Fayetteville, AR 72701, USA
Abstract :

Transgenic crops provide cotton and soybean producers additional weed control options for many of the most problematic weeds in midsouthern United States (U.S.). production systems. The expected commercialization of 4-hydroxyphenylpyruvate dioxygenase (HPPD)-resistant soybean in 2017 and cotton in 2020 will provide producers the option to apply HPPD-inhibiting herbicides that will offer an alternative mechanism of action for previously hardto-control weeds. Experiments were conducted in 2010 and 2011 to determine the efficacy of HPPD-inhibiting herbicides applied preemergence (PRE) or postemergence (POST) for control of problematic weeds of cotton and soybean in the mid southern US. PRE experiments were conducted to understand the length and degree of control of Palmer amaranth and barnyardgrass that could be expected with HPPD-inhibiting herbicides compared with current standards on silt loam and clay soil textures. The HPPD herbicides evaluated included mesotrione, tembotrione, and isoxaflutole compared to several standards currently labeled in soybean. In the POST experiment, applications of isoxaflutole, tembotrione, glyphosate, and two rates of glufosinate applied alone and both HPPD herbicides combined with glyphosate or glufosinate were evaluated for control of Palmer amaranth, barnyardgrass, hemp sesbania, and yellow nutsedge. When herbicides were applied PRE, the HPPD-inhibiting herbicides and the current standard treatments all provided greater than 90% control of Palmer amaranth 4 weeks after treatment (WAT) on both soil textures. Barnyardgrass control with HPPD-inhibitors was generally weaker than the current standards with the exception of mesotrione which proved to be comparable to the standards 4 WAT. In the POST experiment, all treatments, except for glyphosate alone, provided excellent (>85%) control of Palmer amaranth less than 10-cm in height. Barnyardgrass, yellow nutsedge, and hemp sesbania were effectively controlled with HPPDinhibiting herbicides with and without glufosinate or glyphosate.

Keywords :
HPPD-inhibiting herbicides; Preemergence; Postemergence; Tank-mix

Date Deposited : 02 Apr 2016 11:22

Last Modified : 02 Apr 2016 11:22

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Volume 4, Number 1, February 2016

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