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Efficacy of Saflufenacil for Control of Glyphosate-Resistant Horseweed (Conyza canadensis) as Affected by Height, Density, and Time of Day

Published online by Cambridge University Press:  23 January 2017

Christopher M. Budd ,
Nader Soltani ,
Darren E. Robinson ,
David C. Hooker ,
Robert T. Miller  and
Peter H. Sikkema
Christopher M. Budd
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Assistant Professor, and Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, N0P 2C0
Nader Soltani*
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Assistant Professor, and Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, N0P 2C0
Darren E. Robinson
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Assistant Professor, and Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, N0P 2C0
David C. Hooker
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Assistant Professor, and Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, N0P 2C0
Robert T. Miller
Affiliation:
Field Development Representative, BASF Canada, Mississauga, ON, L5R 4H1
Peter H. Sikkema
Affiliation:
Graduate Student, Adjunct Professor, Associate Professor, Assistant Professor, and Professor, Department of Plant Agriculture, University of Guelph, Ridgetown, ON, N0P 2C0
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Control of glyphosate-resistant (GR) horseweed in soybean with glyphosate (900 g ai ha−1) plus saflufenacil (25 gaiha−1) has been variable. The objective of this research was to determine the effect of GR horseweed height, density, and time of day (TOD) at application on saflufenacil plus glyphosate efficacy in soybean. All experiments were completed six times during a 2 yr period (2014, 2015) in fields previously confirmed with GR horseweed. Applications from 0900 to 2100 hours provided optimal control of GR horseweed 8 WAA. Soybean yield paralleled GR horseweed control with the highest yield of 3000kgha−1 at 1500 hours, and the lowest yield of 2400kgha−1 at 0600 hours. The height and density of GR horseweed at application had minimal effect on saflufenacil efficacy. Saflufenacil provided>99% control of GR horseweed when applied to small plants and low densities; however, control decreased to 95% when>25 cm tall, and to 96% in densities>800 plants m−2 at 6 WAA due to some plant regrowth. TOD of application had a greater influence on GR horseweed control with saflufenacil than height or density. To optimize control of GR horseweed, saflufenacil should be applied during daytime hours to small plants at low densities. Optimizing GR horseweed control minimizes weed seed return and weed interference.

Keywords

Glyphosatesaflufenacilhorseweed, Conyza canadensis (L.) Cronq.soybean Glycine max (L.) Merr.BiomassCanada fleabaneglyphosateherbicide resistancesoybeanyield
Type
Weed Management
Information
Weed Science , Volume 65 , Issue 2 , March 2017 , pp. 275 - 284
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Timothy Grey, University of Georgia

References

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