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Accepted manuscript

Control of glufosinate/glyphosate-resistant corn volunteers in imazamox- and quizalofop-resistant sorghum

Published online by Cambridge University Press:  27 August 2025

Mandeep Singh  and
Amit J. Jhala Open the ORCID record for Amit J. Jhala [Opens in a new window]
Mandeep Singh
Affiliation:
Postdoctoral Research Associate, Department of Agronomy and Horticulture, University of Nebraska−Lincoln, Lincoln, NE, USA
Amit J. Jhala*
Affiliation:
Professor & Associate Department Head, Department of Agronomy and Horticulture, University of Nebraska‒Lincoln, Lincoln, NE, USA.
*
Corresponding author: Amit J. Jhala; Email: Amit.Jhala@unl.edu
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Abstract

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Volunteer corn is a problem weed in sorghum fields rotated with corn. The commercial availability of imazamox-resistant (iGrowth™) and quizalofop-resistant (Doube Team™) sorghum allows the use of imazamox and quizalofop, respectively, for controlling grass weeds; however, information is not available for their efficacy for control of volunteer corn. The objectives of this study were to evaluate the efficacy of imazamox and quizalofop for control density, and biomass reduction of glufosinate/glyphosate-resistant corn volunteers in imazamox- and quizalofop-resistant sorghum. Two separate field experiments were conducted near Clay Center, NE, in 2023 and 2024. Imazamox (53 and 79 g ai ha–1) applied early-postemergence (E-POST) and late-postemergence (L-POST) controlled 96% to 98% and 78% to 89% of corn volunteers 28 d after application (DAA) in 2023 and 2024, respectively in iGrowth sorghum. Similarly, quizalofop applied E-POST and L-POST (58 and 73 g ai ha–1) provided 98% and 99% control of volunteer corn in 2023 and 2024, respectively in Double Team sorghum. Quizalofop reduced volunteer corn density (0 to 0.2 plants m–1) and biomass (0 to 13 g m–2) compared to nontreated control in both years. The results suggest that imazamox and quizalofop could be used as POST herbicides for control of glufosinate/glyphosate-resistant corn volunteers in imazamox- and quizalofop-resistant sorghum, respectively.

Keywords

ALS-inhibitorACCase-inhibitorchemical controlDouble Teamherbicide-resistanceiGrowthvolunteer corn

Information

Type
Research Article
Information
Weed Technology , Accepted manuscript , pp. 1 - 20
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America