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Glyphosate-Resistant Horseweed (Conyza canadensis) Dose Response to Saflufenacil, Saflufenacil plus Glyphosate, and Metribuzin plus Saflufenacil plus Glyphosate in Soybean

Published online by Cambridge University Press:  20 January 2017

Christopher M. Budd ,
Nader Soltani ,
Darren E. Robinson ,
David C. Hooker ,
Robert T. Miller  and
Peter H. Sikkema
Christopher M. Budd
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
Nader Soltani*
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
David C. Hooker
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
Robert T. Miller
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph, 120 Main St. East, Ridgetown, ON, N0P 2C0, Canada
*
Corresponding author's E-mail: [email protected]
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Abstract

The control of glyphosate-resistant (GR) horseweed (Conyza canadensis) in soybean has been variable with glyphosate plus saflufenacil. The objective of this research was to determine the biologically effective rate (BER) of saflufenacil, saflufenacil mixed with glyphosate, and metribuzin mixed with saflufenacil and glyphosate applied preplant (PP) for the control of GR horseweed in no-till soybean; a study was conducted to determine each of the three treatments. For each study, seven field sites infested with GR horseweed were used over a 2-yr period (2014, 2015). Saflufenacil alone at 25 and 36 g ai ha–1 provided 90 and 95% control of GR Horseweed 8 wk after application, while the BER to achieve 98% control was outside of the treatment range tested. The saflufenacil plus glyphosate (900 g ai ha–1) BER experiment found less saflufenacil was required as 25, 34, and 47 g ha–1 provided 90, 95, and 98% control of GR horseweed respectively. The metribuzin BER experiment found 61, 261, and 572 g ha–1 was required to provide 90, 95 and 98% control of GR horseweed, respectively, mixed with saflufenacil (25 g ha–1) and glyphosate (900 g ha–1). The addition of metribuzin with the recommended rate of saflufenacil (25 g ha–1) plus glyphosate improved control and a second effective herbicide mode of action for the control of GR horseweed. The use of a threeway herbicide mixture can be an effective weed management strategy to control GR horseweed in soybean.

Keywords

Glyphosatemetribuzinsaflufenacilhorseweed, Conyza canadensis (L.) Cronqsoybean, Glycine max (L.) MerrBiomassglyphosateherbicide resistancehorseweedsoybean, yield
Type
Weed Management
Information
Weed Science , Volume 64 , Issue 4 , December 2016 , pp. 727 - 734
Copyright
Copyright © 2016 by the Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Muthukumar V. Bagavathiannan.

References

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