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Accepted manuscript

Glyphosate-resistant Italian ryegrass (Lolium perenne ssp. multiflorum) control in preemergence and postemergence programs containing mixtures of residual herbicides

Published online by Cambridge University Press:  27 August 2025

Taylor D. Burrell II ,
Jason A. Bond Open the ORCID record for Jason A. Bond [Opens in a new window] ,
Thomas W. Allen ,
Darrin M. Dodds  and
Drew M. Gholson
Taylor D. Burrell II
Affiliation:
Former Graduate Research Assistant, Mississippi State University, Delta Research and Experiment Station, Stoneville, MS, USA
Jason A. Bond*
Affiliation:
Extension/Research Professor, Mississippi State University, Delta Research and Experiment Station, Stoneville, MS, USA
Thomas W. Allen
Affiliation:
Extension/Research Professor, Mississippi State University, Delta Research and Experiment Station, Stoneville, MS, USA
Darrin M. Dodds
Affiliation:
Professor, Plant and Soil Sciences, Mississippi State University, Starkville, MS, USA
Drew M. Gholson
Affiliation:
Associate Professor, Plant and Soil Sciences, Mississippi State University, Stoneville, MS
*
Author for correspondence: Jason A. Bond, Extension/Research Professor, Mississippi State University, Delta Research and Extension Center, P. O. Box 197, Stoneville, MS 38776. E-mail: jbond@drec.msstate.edu
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Abstract

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Glyphosate-resistant (GR) Italian ryegrass is one of the most troublesome weeds of rice in Mississippi. The most effective and economical management strategy to control GR Italian ryegrass is with preemergence (PRE) followed by postemergence (POST) herbicide programs. Two separate field studies were conducted in 2021-22 and 2022-23 in Stoneville, Mississippi, to evaluate GR Italian ryegrass control with fall-applied residual herbicide mixtures (Herbicide Mixture Study) and sequential PRE followed by POST herbicide programs with multiple applications of residual herbicides (Sequential Herbicide Application Study). In the Herbicide Mixture Study, dimethenamid-P, pyroxasulfone, and S-metolachlor alone provided ≥ 94% control of GR Italian ryegrass 21 d after treatment (DAT). The addition of flumioxazin to dimethenamid-P, pyroxasulfone, and S-metolachlor did not improve control 130 DAT. In the Sequential Herbicide Application Study, treatments with fall-applied dimethenamid-P performed better than those with acetochlor, except when fall-applied acetochlor was followed by a sequential application of clethodim plus S-metolachlor. Fall-applied residual herbicides are a necessary component of programs for control of GR Italian ryegrass in Mississippi.

Keywords

sequential applicationfall-appliedresidual herbicide mixtures

Information

Type
Research Article
Information
Weed Technology , Accepted manuscript , pp. 1 - 18
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