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1 March 2016 Control of Glyphosate-Resistant Horseweed in Winter Wheat with Pyrasulfotole Premixed with Bromoxynil
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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.

Nomenclature: Glyphosate; horseweed, Conyza canadensis (L.) Cronq.; winter wheat, Triticum aestivum L.

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.

Kris J. Mahoney, Kristen E. McNaughton, and Peter H. Sikkema "Control of Glyphosate-Resistant Horseweed in Winter Wheat with Pyrasulfotole Premixed with Bromoxynil," Weed Technology 30(1), 291-296, (1 March 2016). https://doi.org/10.1614/WT-D-15-00046.1
Received: 7 April 2015; Accepted: 1 September 2015; Published: 1 March 2016
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