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Effectiveness of glufosinate, dicamba, and clethodim on glyphosate-resistant and -susceptible populations of five key weeds in Australian cotton systems

Published online by Cambridge University Press:  14 July 2021

Jeff Werth Open the ORCID record for Jeff Werth [Opens in a new window] ,
David Thornby ,
Michelle Keenan ,
James Hereward  and
Bhagirath Singh Chauhan
Jeff Werth*
Affiliation:
Senior Research Scientist and Experimentalist, Department of Agriculture and Fisheries, Leslie Research Facility, Toowoomba, Queensland, Australia
David Thornby
Affiliation:
Director, Innokas Intellectual Services, Upper Coomera, Queensland, Australia
Michelle Keenan
Affiliation:
Senior Research Scientist and Experimentalist, Department of Agriculture and Fisheries, Leslie Research Facility, Toowoomba, Queensland, Australia
James Hereward
Affiliation:
Senior Research Fellow and Professor, Queensland Alliance for Agriculture and Food Innovation and School of Agriculture and Food Science, The University of Queensland, Gatton, Queensland, Australia
Bhagirath Singh Chauhan
Affiliation:
Senior Research Fellow and Professor, Queensland Alliance for Agriculture and Food Innovation and School of Agriculture and Food Science, The University of Queensland, Gatton, Queensland, Australia
*
Author for correspondence: Jeff Werth, Department of Agriculture and Fisheries, Leslie Research Facility, 13 Holberton Street, Toowoomba, Queensland4350, Australia. Email: Jeff.Werth@daf.qld.gov.au
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Abstract

XtendFlexTM cotton with resistance to glyphosate, glufosinate, and dicamba may become available in Australia. Resistance to these herbicides enables two additional modes of action to be applied in crop. The double-knock strategy, typically glyphosate followed by paraquat, has been a successful tactic for control of glyphosate-resistant cotton in fallow situations in Australia. Glufosinate is a contact herbicide and may be useful as the second herbicide in a double knock for use in XtendFlexTM cotton crops. We tested the effectiveness of glufosinate applied at intervals of 1, 3, 7, and 10 d after initial applications of glyphosate, dicamba, clethodim, and glyphosate mixtures with dicamba or clethodim on glyphosate-resistant and glyphosate-susceptible populations of flaxleaf fleabane, common sowthistle, feather fingergrass, windmill grass, and junglerice. Effective treatments for flaxleaf fleabane with 100% control were dicamba and glyphosate+dicamba followed by glufosinate independent of the interval between applications. Common sowthistle was effectively controlled in Experiment 1 by all treatments. However, in Experiment 2, effective treatments were dicamba and glyphosate+dicamba followed by glufosinate (99.3% to 100% control). Timing of the follow-up glufosinate did not affect the control achieved. Consistent control of feather fingergrass was achieved with glyphosate, clethodim, or glyphosate+clethodim followed by glufosinate at 7-d and 10-d intervals (99.7% to 100% control). Control of feather fingergrass was inconsistent. The best treatment for windmill grass was glyphosate+clethodim followed by glufosinate 10 d later (99.8% to 100% control). Junglerice was effectively controlled with all treatments except for glyphosate on the glyphosate-resistant population. Additional in-crop use of glufosinate and dicamba should be beneficial for weed management in XtendFlexTM cotton crops, when using the double knock tactic with glufosinate. For effective herbicide resistance management, it is important that these herbicides be used in addition to, rather than substitution for, existing weed management tactics.

Keywords

GlyphosateglufosinatedicambacottonGossypium hirsutum L.flaxleaf fleabaneConyza bonariensis (L.) Cronquistcommon sowthistleSonchus oleraceus L.feather fingergrassChloris virgata Sw.windmill grassChloris truncata R. Br.junglericeEchinochloa colona (L.) Linkdouble knockweed controlintegrated weed management
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 6 , December 2021 , pp. 967 - 973
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Weed Science Society of America

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Footnotes

Associate Editor: Daniel Stephenson; Louisana State University Agricultural Center

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