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Time-of-day effect on weed control efficacy with tolpyralate plus 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. Raedar ,
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. Raedar
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:
Associate 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

Tolpyralate is a new 4-hydroxyphenyl-pyruvate dioxygenase (HPPD)–inhibiting herbicide for weed control in corn. Previous research has reported efficacy of tolpyralate + atrazine on several annual grass and broadleaf weed species; however, no studies have evaluated weed control of tolpyralate + atrazine depending on time-of-day (TOD) of application. Six field experiments were conducted over a 2-yr period (2018, 2019) near Ridgetown, ON, to determine if there is an effect of TOD of application on tolpyralate + atrazine efficacy on common annual grass and broadleaf weeds. An application was made at 3-h intervals beginning at 06:00 h with the last application at 24:00 h. There was a slight TOD effect on velvetleaf, pigweed species, and common ragweed control with tolpyralate + atrazine; however, the magnitude of change throughout the day was ≤3% at 2, 4, or 8 wk after application (WAA). There was no effect of TOD of tolpyralate + atrazine on the control of lambsquarters, barnyardgrass, and green foxtail. All weed species were controlled ≥88% at 8 WAA. There was no effect of TOD of tolpyralate + atrazine application on corn yield. Results of this study show no evidence of a TOD effect on weed control efficacy with tolpyralate + atrazine.

Keywords

AtrazinetolpyralatebarnyardgrassEchinochloa crus-galli (L.) P. Beauv.common ragweedAmbrosia artemisiifolia L.green foxtailSetaria viridis (L.) P. Beauvhemp sesbaniaSesbania herbacea (Mill.) McVaughlambsquartersChenopodium album L.redroot pigweedAmaranthus retroflexus L.sicklepodSenna obtusifolia (L.) H.S. Irwin & BarnebyvelvetleafAbutilon theophrasti Medik.cornZea mays L.Crop injurydensitysensitivityyield
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 1 , February 2021 , pp. 149 - 154
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Aaron Hager, University of Illinois

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