alexa Use of Hppd-inhibiting Herbicides for Control of Troubl
ISSN: 2329-8863

Advances in Crop Science and Technology
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Research Article

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
Corresponding Author : Lauren M. Schwartz
Department of Crop, Soils, and
Environmental Sciences University of Arkansas
1366 West Altheimer Drive, Fayetteville, AR72701, USA
Tel: 479-575-3955
[email protected]
Received December 04, 2015; Accepted January 05, 2016; Published January 11, 2016
Citation: Starkey CE, Norsworthy JK, Schwartz LM (2016) Use of Hppd-inhibiting Herbicides for Control of Troublesome Weeds in the Midsouthern United States. Adv Crop Sci Tech 4:205. doi:10.4172/2329-8863.1000205
Copyright: © 2016 Starkey CE, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Transgenic crops provide cotton and soybean producers additional weed control options for many of the most problematic weeds in mid southern US. 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 pre emergence (PRE) or post emergence (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 barn yard grass 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, barn yard grass, 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. Barn yard grass 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. Barn yard grass, yellow nutsedge, and hemp sesbania were effectively controlled with HPPDinhibiting herbicides with and without glufosinate or glyphosate.


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