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Control of Glyphosate-Resistant Common waterhemp (Amaranthus rudis) in Three New Herbicide-Resistant Soybean Varieties in Ontario

Published online by Cambridge University Press:  21 November 2017

Mike G. Schryver ,
Nader Soltani ,
David C. Hooker ,
Darren E. Robinson ,
Patrick J. Tranel  and
Peter H. Sikkema
Mike G. Schryver
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Associate Professor, and Professor, Department of Plant Agriculture, University of Guelph, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
Nader Soltani*
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Associate Professor, and Professor, Department of Plant Agriculture, University of Guelph, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
David C. Hooker
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Associate Professor, and Professor, Department of Plant Agriculture, University of Guelph, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
Darren E. Robinson
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Associate Professor, and Professor, Department of Plant Agriculture, University of Guelph, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
Patrick J. Tranel
Affiliation:
Professor, Department of Crop Science. University of Illinois at Urbana–Champaign, 1201 West Gregory Drive, Urbana, IL 61801, USA
Peter H. Sikkema
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Associate Professor, and Professor, Department of Plant Agriculture, University of Guelph, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
*
*Corresponding author’s E-mail: soltanin@uoguelph.ca
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Abstract

Glyphosate-resistant (GR) common waterhemp (CW) is a localized weed in Ontario and one of the most problematic weeds in the US Corn Belt. First confirmed in Ontario in 2014, GR CW has now been confirmed in forty fields in three counties in Ontario as of 2015. Historically, the primary POST herbicides used for the control of CW in soybean were glyphosate, acifluorfen and fomesafen, but resistance to all three has been confirmed in many US states. Research was conducted in 2015 and 2016 to determine the control of GR CW with some of the new herbicide-resistant soybean technologies including glufosinate (LibertyLink), 2,4-D and glyphosate (Enlist), and isoxaflutole, mesotrione, and glufosinate (HPPD-resistant). Glyphosate-resistant CW was controlled (≥90%) all season with a two-pass weed control system across all herbicide-resistant soybean technologies evaluated. The two-pass weed control system in this research is defined as a PRE herbicide followed by a POST herbicide. At 12 WAA, the two-pass programs in LibertyLink, Enlist, and HPPD-resistant systems controlled GR CW up to 98, 98, and 92%, respectively, and reduced GR CW densities to 0 to 2% of the weedy control at 4 WAA. The two-pass programs provided greater GR CW control than PRE or POST herbicides alone. This study found that the use of two-pass weed control programs in glufosinate-resistant, glyphosate DMA/2,4-D choline-resistant and HPPD-resistant soybean can provide excellent control of GR CW, and can be valuable tools to reduce the selection intensity for herbicide-resistant weeds. Through the rotational use of different technologies, growers may be able to better manage their weed populations in reducing the risk of resistance when compared to the use of one herbicide repeatedly.

Keywords

Glufosinateglyphosatecommon waterhemp, Amaranthus rudis Sauersoybean, Glycine max (L.) Merr.Enlist soybeanglufosinate resitanceglyphosate resistanceglyphosate susceptible4-hydroxyphenylpyruvate dioxygenase–resistant soybeanLibertyLink soybean
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 31 , Issue 6 , December 2017 , pp. 828 - 837
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Aaron Hager, University of Illinois.

References

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