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Control of glyphosate-resistant horseweed and giant ragweed in soybean with halauxifen-methyl applied preplant

Published online by Cambridge University Press:  04 November 2020

Jessica Quinn ,
Jamshid Ashigh ,
Nader Soltani Open the ORCID record for Nader Soltani [Opens in a new window] ,
David C. Hooker ,
Darren E. Robinson  and
Peter H. Sikkema
Jessica Quinn
Affiliation:
Graduate Student, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Jamshid Ashigh
Affiliation:
Research Scientist, Corteva Agriscience Inc., London, ON, Canada
Nader Soltani*
Affiliation:
Adjunct Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
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, Ridgetown, ONN0P 2C0 Email: soltanin@uoguelph.ca
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Abstract

Horseweed and giant ragweed are competitive, annual weeds that can negatively impact crop yield. Biotypes of glyphosate-resistant (GR) giant ragweed and horseweed were first reported in 2008 and 2010 in Ontario, respectively. GR horseweed has spread throughout the southern portion of the province. The presence of GR biotypes poses new challenges for soybean producers in Canada and the United States. Halauxifen-methyl is a recently registered selective herbicide against broadleaf weeds for preplant use in corn and soybean. There is limited literature on the efficacy of halauxifen-methyl on GR horseweed and giant ragweed when combined with currently registered products in Canada. The purpose of this study was to determine the effectiveness of halauxifen-methyl applied alone and tank-mixed to control GR giant ragweed and GR horseweed in glyphosate and dicamba-resistant (GDR) soybean in southwestern Ontario. Six field experiments were conducted separately for each weed species over 2018 and 2019. Halauxifen-methyl applied alone offered 72% control of GR horseweed at 8 wk after application (WAA). Control was improved to >91% when halauxifen-methyl applied in combination with metribuzin, saflufenacil, chlorimuron-ethyl + metribuzin, and saflufenacil + metribuzin. At 8 WAA, halauxifen-methyl provided 11% control of GR giant ragweed, and 76% to 88% control when glyphosate/2,4-D choline, glyphosate/dicamba, glyphosate/2,4-D choline + halauxifen-methyl, and glyphosate/dicamba + halauxifen-methyl were used. We conclude that halauxifen-methyl applied preplant in a tank-mixture can provide effective control of GR giant ragweed and horseweed in GDR soybean.

Keywords

Giant ragweed, Ambrosia trifida L.horseweed, Conyza canadensis (L.) Cronq.soybean, Glycine max (L.) Merr.BiomassGlycine max (L.) Merr.glyphosate-resistancemarestailyield
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 2 , April 2021 , pp. 324 - 329
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: Vipan Kumar, Kansas State University

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