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Response of dry beans to tiafenacil applied preemergence

Published online by Cambridge University Press:  19 August 2021

Nader Soltani Open the ORCID record for Nader Soltani [Opens in a new window] ,
Christy Shropshire  and
Peter H. Sikkema
Nader Soltani*
Affiliation:
Adjunct Professor, University of Guelph, Ridgetown, ON, Canada
Christy Shropshire
Affiliation:
Research Technician, University of Guelph, Ridgetown, ON, Canada
Peter H. Sikkema
Affiliation:
Professor, University of Guelph, Ridgetown, ON, Canada
*
Author for correspondence: Nader Soltani, Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, CanadaN0P 2C0. Email: soltanin@uoguelph.ca
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Abstract

Tiafenacil is a new nonselective, protoporphyrinogen IX oxidase–inhibiting pyrimidinedione herbicide that is under consideration for registration to control grass and broadleaf weeds in corn, soybean, wheat, cotton, and other crops prior to crop emergence. The sensitivity of dry beans to tiafenacil is not known. Four field experiments were completed at Exeter and Ridgetown, ON, Canada, during the 2019 and 2020 growing seasons, to determine the sensitivity of azuki, kidney, small red, and white beans to tiafenacil applied preemergence (PRE) at 12.5, 25, 50, and 100 g ai ha−1. Tiafenacil applied at 100 g ai ha−1 caused 5% or less injury to azuki, kidney, small red, and white beans: 0% to 3% injury to azuki bean; 1% to 5% injury to kidney bean; and 1% to 4% injury to both small red bean and white bean. Tiafenacil applied PRE at 12.5, 25, 50, and 100 g ai ha−1 caused up to 1%, 4%, 4%, and 5% visible dry bean injury, respectively, but had no negative effect on other measured growth parameters including seed yield. Crop injury was generally greatest when tiafenacil was appled at the 100 g ai ha−1 rate in dry beans. Generally, kidney, small red, and white bean were more sensitive to tiafenacil than azuki bean. Dry bean injury was persistent and increased with time with the greatest injury observed 8 wk after emergence. Tiafenacil applied PRE can be a useful addition to the current strategies to control grass and broadleaf weeds, especially glyphosate-resistant horseweed and amaranth species prior to bean emergence.

Keywords

Tiafenacildry bean, Phaseolus vulgarisazuki bean, Vigna angularisBiomassinjurydensitydry biomassheightplant standvisible control
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 6 , December 2021 , pp. 991 - 994
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: David Johnson, Corteva Agriscience

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