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Influence of Glyphosate or Glufosinate Combinations with Growth Regulator Herbicides and Other Agrochemicals in Controlling Glyphosate-Resistant Weeds

Published online by Cambridge University Press:  20 January 2017

Gurinderbir S. Chahal*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
William G. Johnson
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
*
Corresponding author's E-mail: gschahal@purdue.edu

Abstract

With the forthcoming release of the 2,4-D- and dicamba-resistance traits stacked with either glyphosate or glufosinate resistance, the use of 2,4-D or dicamba alone or in tank mix with glyphosate or glufosinate likely will increase the control of glyphosate-resistant weeds in soybean. There also is an increasing trend among soybean growers to apply POST herbicides in combination with fungicides, insecticides, and fertilizers to reduce trips over the field. Greenhouse experiments were conducted during 2011 and 2012 to evaluate glyphosate or glufosinate applications with growth regulator herbicides and other agrochemicals for the control of glyphosate-resistant horseweed and glyphosate-resistant common lambsquarters. In most cases, glyphosate or glufosinate application with 2,4-D or dicamba provided 80% or more control of glyphosate-resistant horseweed and glyphosate-resistant common lambsquarters. These studies demonstrate that performance of glufosinate alone and with agrochemicals was poor on glyphosate-resistant common lambsquarters. However, no differences in glyphosate-resistant common lambsquarters biomass were noted among treatments including glufosinate alone, glufosinate plus growth regulator herbicides, and glufosinate plus growth regulator herbicides plus agrochemicals. The agrochemicals lambda-cyhalothrin, manganese, and pyraclostrobin did not affect weed control by glyphosate or glufosinate combinations with growth regulator herbicides. Visible soybean injury was noted at 1 wk after treatment (WAT) only when glufosinate was applied with lambda-cyhalothrin or pyraclostrobin but no differences in visible injury were seen with these combinations at 3 WAT.

Con la próxima liberación de cultivos con resistencia a 2,4-D y dicamba en combinación con resistencia a glyphosate o glufosinate, es probable que el uso de 2,4-D o dicamba solos o en mezclas en tanque con glyphosate o glufosinate incrementará el control de malezas resistentes a glyphosate en soya. También, hay un tendencia creciente de que los productores apliquen herbicidas POST en combinación con fungicidas, insecticidas y fertilizantes para reducir el número de pases de aplicación en campo. Se realizaron experimentos de invernadero durante 2011 y 2012 para evaluar aplicaciones de glyphosate o glufosinate con herbicidas reguladores de crecimiento y otros agroquímicos, para el control de Conyza canadensis y Chenopodium album resistentes a glyphosate. En la mayoría de los casos, las aplicaciones de glyphosate o glufosinate con 2,4-D o dicamba brindaron 80% de control o más de C. canadensis y C. album resistentes a glyphosate. Estos estudios demostraron que el desempeño de glufosinate solo y con agroquímicos fue pobre sobre C. album resistente a glyphosate. Sin embargo, no se notaron diferencias en la biomasa de C. album resistente a glyphosate entre tratamientos incluyendo a glufosinate solo, glufosinate más herbicidas reguladores de crecimiento y glufosinate más herbicidas reguladores de crecimiento más agroquímicos. Los agroquímicos lambda-cyhalothrin, manganese y pyroclostrobin no afectaron el control de malezas al combinar glyphosate o glufosinate con herbicidas reguladores de crecimiento. El daño visible en la soya se notó a 1 semana después del tratamiento (WAT) solamente cuando glufosinate fue aplicado con lambda-cyhalothrin o pyraclostrobin, pero no se observaron diferencias en daño con estas combinaciones a 3 WAT.

Type
Weed Management—Major Crops
Copyright
Copyright © Weed Science Society of America 

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