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Accepted manuscript

Interaction of pyroxasulfone and encapsulated saflufenacil applied preemergence to corn

Published online by Cambridge University Press:  02 June 2025

Erica D. Nelson ,
Nader Soltani Open the ORCID record for Nader Soltani [Opens in a new window] ,
Christopher Budd ,
Peter H. Sikkema  and
Darren E. Robinson
Erica D. Nelson
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
Christopher Budd
Affiliation:
Senior Biologist, BASF Canada Inc., London, ON, Canada
Peter H. Sikkema
Affiliation:
Professor Emeritus, 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
*
Author for correspondence: Nader Soltani, Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON, Canada N0P 2C0, Email: soltanin@uoguelph.ca
Rights & Permissions [Opens in a new window]

Abstract

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A new formulation of pyroxasulfone + encapsulated saflufenacil has been developed. Combining these two herbicides extends the application window to early postemergence. Pyroxasulfone, saflufenacil (suspension concentrate), and pyroxasulfone + encapsulated saflufenacil (microcapsule suspension) were applied to corn preemergence and evaluated for corn injury, corn yield, and visible weed control; in addition, the interaction (antagonistic, additive, or synergistic) was ascertained for each parameter. Six field trials were conducted at three locations in southwestern Ontario in 2022 and 2023. Pyroxasulfone was applied at 90, 120, and 150 g ai ha−1; saflufenacil was applied at 56, 75, and 95 g ai ha−1; and pyroxasulfone + encapsulated saflufenacil was applied at 146, 195, 245 g ai ha−1, equal to the combined rates of pyroxasulfone and saflufenacil. All pyroxasulfone, encapsulated saflufenacil, and pyroxasulfone + encapsulated saflufenacil treatments caused no corn injury. Weed control varied based on application rate and weed species. Reduced weed interference with pyroxasulfone + encapsulated saflufenacil at 195 and 245 g ai ha−1 resulted in corn yield that was similar to the weed-free control and the industry standard of S-metolachlor/atrazine/mesotrione/bicyclopyrone. The interaction between pyroxasulfone and encapsulated saflufenacil for weed control was additive.

Keywords

Additiveantagonisticcorn injurycorn yieldencapsulationherbicide formulationinteractionsynergistic
Type
Research Article
Information
Weed Technology , Accepted manuscript , pp. 1 - 18
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America