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Control of Glyphosate-Resistant Horseweed (Conyza canadensis) with Dicamba Applied Preplant and Postemergence in Dicamba-Resistant Soybean

Published online by Cambridge University Press:  20 January 2017

Holly P. Byker ,
Nader Soltani ,
Darren E. Robinson ,
François J. Tardif ,
Mark B. Lawton  and
Peter H. Sikkema
Holly P. Byker
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, N0P 2C0
Nader Soltani*
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, N0P 2C0
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, N0P 2C0
François J. Tardif
Affiliation:
Department of Plant Agriculture, Guelph, 50 Stone Rd. East, Guelph, ON, N1G 2W1
Mark B. Lawton
Affiliation:
Monsanto Canada Inc., Guelph, ON, N1G 0B4
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, N0P 2C0
*
Corresponding author's E-mail: soltanin@uoguelph.ca
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Abstract

Herbicide-resistant crops, such as glyphosate-resistant (GR) soybean, allow for broad-spectrum, flexible weed control with minimal crop injury; however, the development of GR weeds, such as horseweed, has forced reliance on alternative herbicides for control of these weeds. While preplant (PP) herbicides provide excellent control of GR-horseweed, there are currently no POST herbicide control options within soybean. The objective of this study was to evaluate the efficacy of dicamba for the control of GR-horseweed when applied PP, POST, and sequentially in dicamba-resistant soybean. Dicamba applied PP at 600 g a.e. ha−1 provided 90 to 100% control of GR-horseweed 8 wk after application (WAA) across three field trials conducted in Ontario in 2011 and 2012. Similarly, sequential applications provided 91 to 100% control. This technology provides a much-needed POST option of dicamba to be applied as a rescue treatment to control weed escapes caused by late emergence or poor initial control following a PP herbicide application.

Los cultivos resistentes a herbicidas, tales como la soya resistente a glyphosate (GR), hacen posible un control de malezas de amplio espectro y flexible, con un daño mínimo al cultivo. Sin embargo, el desarrollo de malezas GR, como el caso de Conyza canadensis, ha llevado a la dependencia de herbicidas alternativos para el control de estas malezas. Mientras que los herbicidas pre-siembra (PP) brindan un control excelente de C. canadensis GR, actualmente no hay opciones de control con herbicidas POST en soya. El objetivo de este estudio fue evaluar la eficacia de dicamba para el control de C. canadensis GR cuando se aplicó PP, POST, y secuencialmente en soya resistente a dicamba. Dicamba aplicado PP a 600 g a.e. ha−1 brindó 90 a 100% de control de C. canadensis GR 8 semanas después de la aplicación (WAA) en tres estudios de campo realizados en Ontario en 2011 y 2012. Similarmente, aplicaciones secuenciales brindaron 91 a 100% de control. Esta tecnología brinda una muy necesitada opción de control POST al aplicar dicamba como tratamiento de rescate para controlar escapes de malezas causados debido a emergencia tardía o a un control inicial limitado después de una aplicación de un herbicida PP.

Keywords

DicambaglyphosatehorseweedConyza canadensis (L). CronqsoybeanGlycine max (L.) MerrGlyphosate resistancemultiple herbicide-resistant cropspreplant (PP) herbicidesPOST herbicides
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 492 - 496
Copyright
Copyright © Weed Science Society of America 

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