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Halauxifen-methyl controls glyphosate-resistant horseweed (Conyza canadensis) but not giant ragweed (Ambrosia trifida) in winter wheat

Published online by Cambridge University Press:  10 February 2020

Jessica Quinn ,
Nader Soltani Open the ORCID record for Nader Soltani [Opens in a new window] ,
Jamshid Ashigh ,
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
Nader Soltani*
Affiliation:
Adjunct Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, Canada
Jamshid Ashigh
Affiliation:
Research Scientist, Corteva Agriscience Inc., London, 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, 120 Main Street East, Ridgetown, ONN0P 2C0. Email: soltanin@uoguelph.ca
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Abstract

Horseweed is a competitive summer or winter annual weed that produces up to 230,000 small seeds per plant that are capable of traveling more than 500 km via wind. Giant ragweed is a tall, highly competitive summer annual weed. Glyphosate-resistant (GR) horseweed and GR giant ragweed pose significant challenges for producers in the United States and Ontario, Canada. It is thought that an integrated weed management (IWM) system involving herbicide rotation is required to control GR biotypes. Halauxifen-methyl is a new selective broadleaf POST herbicide registered for use in cereal crops; there is limited information on its efficacy on horseweed and giant ragweed. The purpose of this research was to determine the efficacy of halauxifen-methyl applied POST, alone and in a tank mix, for the control of GR horseweed and GR giant ragweed in wheat across southwestern Ontario. For each weed species, an efficacy study consisting of six field experiments was conducted over a 2-yr period (2018, 2019). At 8 wk after application (WAA), halauxifen-methyl, fluroxypyr/halauxifen-methyl, fluroxypyr/halauxifen-methyl + MCPA EHE, fluroxypyr + MCPA ester, 2,4-D ester, clopyralid, and pyrasulfotole/bromoxynil + ammonium sulfate controlled GR horseweed >95%. Fluroxypyr and MCPA provided only 86% and 37% control of GR horseweed, respectively. At 8 WAA, fluroxypyr, fluroxypyr/halauxifen-methyl, fluroxypyr/halauxifen-methyl + MCPA EHE, fluroxypyr + MCPA ester, fluroxypyr/halauxifen-methyl + MCPA EHE + pyroxsulam, 2,4-D ester, clopyralid, and thifensulfuron/tribenuron + fluroxypyr + MCPA ester controlled GR giant ragweed 87%, 88%, 90%, 94%, 96%, 96%, 98%, and 93%, respectively. Halauxifen-methyl and pyroxsulam provided only 45% and 28% control of GR giant ragweed, respectively. Halauxifen-methyl applied alone POST in the spring controlled GR horseweed but not GR giant ragweed in winter wheat.

Keywords

2,4-D esterammonium sulfatebromoxynilclopyralidfluroxypyrhalauxifen-methylMCPA EHEMCPA esterpyrasulfotolepyroxsulamthifensulfurontribenurongiant ragweed, Ambrosia trifida L.horseweed, Conyza canadensis (L.) Cronq.wheat, Triticum aestivum L.Biomasscrop injurydensitysensitivityweed controlyield response
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 4 , August 2020 , pp. 607 - 612
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Drew Lyon, Washington State University.

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