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Control of Glyphosate-Resistant Horseweed in Winter Wheat with Pyrasulfotole Premixed with Bromoxynil

Published online by Cambridge University Press:  20 January 2017

Kris J. Mahoney ,
Kristen E. Mcnaughton  and
Peter H. Sikkema
Kris J. Mahoney*
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
Kristen E. Mcnaughton
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON, N0P 2C0, Canada
*
Corresponding author's E-mail: kmahoney@uoguelph.ca.
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Abstract

Five experiments were conducted over a 2-yr period (2013 and 2014) to evaluate POST herbicides in winter wheat fields with a history of glyphosate-resistant (GR) horseweed. Control 4 wk after treatment (WAT) with pyrasulfotole + bromoxynil was 95%. Control 8 WAT with 2,4-D, dicamba + MCPA + mecoprop, clopyralid, and pyrasulfotole + bromoxynil ranged from 89 to 97%; these herbicides also reduced GR horseweed density and biomass by 97 to 99%. Single mode of action herbicides like 2,4-D controlled GR horseweed; however, multiple modes of action should be used to prevent populations from becoming incrementally more resistant under repeated selection pressure.

Cinco experimentos fueron realizados durante un período de dos años (2013 y 2014) para evaluar herbicidas POST en campos de trigo de invierno con historial de Conyza canadensis resistente a glyphosate (GR). El control 4 semanas después del tratamiento (WAT) con pyrasulfotole + bromoxynil fue 95%. El control 8 WAT con 2,4-D, dicamba + MCPA + mecoprop, clopyralid, y pyrasulfotole + bromoxynil varió de 89 a 97%. Estos herbicidas también redujeron la densidad y la biomasa de C. canadensis GR en 97 a 99%. Herbicidas con un solo modo de acción, tales como 2,4-D, controlaron C. canadensis GR. Sin embargo, se deberían usar múltiples modos de acción para prevenir que las poblaciones se vuelvan incrementalmente más resistentes como consecuencia de una selección de presión repetida.

Keywords

Glyphosatehorseweed, Conyza canadensis (L.) Cronq.winter wheat, Triticum aestivum L.Glyphosate resistanceintegrated weed managementPOST herbicidesweed control
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 1 , March 2016 , pp. 291 - 296
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Ian Burke, Washington State University.

References

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