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Influence of glyphosate on corn hybrid tolerance to tolpyralate + atrazine

Published online by Cambridge University Press:  18 August 2020

Nicole M. Langdon ,
Nader Soltani Open the ORCID record for Nader Soltani [Opens in a new window] ,
Alan J. Raeder ,
David C. Hooker ,
Darren E. Robinson  and
Peter H. Sikkema
Nicole M. Langdon
Affiliation:
Graduate Student, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Nader Soltani*
Affiliation:
Adjunct Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Alan J. Raeder
Affiliation:
Herbicide Field Development and Technical Service Representative, ISK Biosciences Inc., Concord, OH, USA
David C. Hooker
Affiliation:
Associate Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Darren E. Robinson
Affiliation:
Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Peter H. Sikkema
Affiliation:
Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
*
Author for correspondence: Nader Soltani, Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON, CanadaN0P 2C0. Email: soltanin@uoguelph.ca
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Abstract

This study consisting of six field experiments was conducted in 2018 and 2019 to evaluate the tolerance of four corn hybrids (P9998AM, P9840AM, DKC42-60RIB, and DKC43-47RIB) to the tank mix of tolpyralate + atrazine with a commercial glyphosate formulation. At 1 wk after application (WAA), two corn hybrids (P9998AM and P9840AM) exhibited more injury from tolpyralate + atrazine (2× rate) applied alone and in combination with glyphosate than DKC42-60RIB and DKC43-47RIB; however, all corn hybrids responded similarly with respect to visible injury 2, 4, and 8 WAA, stand loss, and yield. Application of tolpyralate + atrazine or glyphosate + tolpyralate + atrazine at the 2× rate caused greater corn injury (up to 27%) than tolpyralate + atrazine or glyphosate + tolpyralate + atrazine at the 1× rate (up to 8%) at 1 WAA. The addition of commercial glyphosate with tolpyralate + atrazine did not enhance injury symptoms. Results of this study show that there is a wide margin of corn safety with tolpyralate + atrazine applied alone and in combination with a commercial formulation of glyphosate.

Keywords

Benzoylpyrazolescorn hybridscrop sensitivityisoxazolesplant standtriketonesyieldAtrazineglyphosatetolpyralatecornZea mays L
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 6 , December 2020 , pp. 882 - 887
Copyright
© The Author(s), 2020 Published by Cambridge University Press on behalf of Weed Science Society of America

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Footnotes

Associate Editor: Kevin Bradley, University of Missouri

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