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Mesotrione: a new preemergence herbicide option for wild radish (Raphanus raphanistrum) control in wheat

Published online by Cambridge University Press:  27 October 2021

Michael J. Walsh*
Affiliation:
Associate Professor, Sydney Institute of Agriculture, School of Life and Environmental Sciences, University of Sydney, Camden, NSW, Australia
Peter Newman
Affiliation:
Farm Business Consultant, Planfarm, GeraldtonWA, Australia
Paul Chatfield
Affiliation:
Technical Manager, Syngenta Australia, Macquarie Park, NSW, Australia
*
Author for correspondence: Michael J. Walsh, University of Sydney, 380 Werombi Road, Brownlow Hill, NSW2570, Australia Email: [email protected]

Abstract

Wild radish is the most problematic broadleaf weed in Australian grain production. The propensity of wild radish to evolve resistance to herbicides has led to high frequencies of multiple herbicide–resistant populations present in these grain production regions. The objective of this study was to evaluate the potential of mesotrione to selectively control wild radish in wheat. The initial dose response pot trials determined that at the highest mesotrione rate of 50 g ha−1 applied preemergence (PRE) was 30% more effective than when applied postemergence (POST) on wild radish. This same rate of mesotrione applied POST resulted in a 30% reduction in wheat biomass compared to 0% for the PRE application. Subsequent mesotrione PRE dose response trials identified a wheat selective rate range of >100 and <300 g ai ha−1 that provided greater than 85% wild radish control with less than 15% reduction in wheat growth. Field evaluations confirmed the efficacy of mesotrione at 100 to 150 g ai ha−1 in reducing wild radish populations by greater than 85% following PRE application and incorporation by wheat planting. Additionally, these field trials demonstrated the opportunity for season-long control of wild radish when mesotrione applied PRE was followed by bromoxynil applied POST. The sequential PRE application of mesotrione, a herbicide that inhibits p-hydroxyphenylpyruvate dioxygenase, followed by POST application of bromoxynil, a herbicide that inhibits photosystem II, has the potential to provide 100% wild radish control with no effect on wheat growth.

Type
Research Article
Copyright
© The University of Sydney, 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Amit Jhala, University of Nebraska, Lincoln

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