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Control of Glyphosate-Resistant Common Waterhemp (Amaranthus tuberculatus var. rudis) in Soybean in Ontario

Published online by Cambridge University Press:  27 September 2017

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
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
*
1Corresponding author’s E-mail: soltanin@uoguelph.ca

Abstract

Glyphosate-resistant (GR) common waterhemp is the fifth GR weed species confirmed in Canada, and the fourth in Ontario. As of 2017, GR common waterhemp has been confirmed in Lambton, Essex, and Chatham-Kent counties in Ontario. Greenhouse and field dose–response experiments revealed that GR common waterhemp in Ontario had a resistance level of 4.5 and 28, respectively, when compared with known glyphosate-susceptible populations. At 12 wk after application, pyroxasulfone/flumioxazin (240 g ai ha−1), pyroxasulfone/sulfentrazone (300 g ai ha−1), and S-metolachlor/metribuzin (1,943 g ai ha−1) controlled GR common waterhemp 97%, 92%, and 87%, respectively. Pyroxasulfone/sulfentrazone or S-metolachlor/metribuzin applied PRE followed by acifluorfen (600 g ai ha−1) or fomesafen (240 g ai ha−1) applied POST controlled GR common waterhemp 98% and performed better than PRE or POST alone. This research is the first to determine the resistance factor of GR common waterhemp in Ontario and identifies control strategies in soybean to mitigate the impact of common waterhemp interference in soybean crop production.

Type
Weed Management-Major Crops
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: William Johnson, Purdue University

References

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