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Herbicide Programs for Controlling Glyphosate-Resistant Johnsongrass (Sorghum halepense) in Glufosinate-Resistant Soybean

Published online by Cambridge University Press:  20 January 2017

Dennis B. Johnson ,
Jason K. Norsworthy  and
Robert C. Scott
Dennis B. Johnson*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Jason K. Norsworthy
Affiliation:
Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
Department of Crop, Soil, and Environmental Sciences, Box 357, Lonoke, AR 72086
*
Corresponding author's E-mail: [email protected].
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Abstract

Three field experiments were conducted in 2010 and 2012 in a soybean production field near West Memphis, AR, containing glyphosate-resistant johnsongrass. The goal of this research was to develop effective herbicide programs for glyphosate-resistant johnsongrass in glufosinate-resistant soybean. Control of the resistant johnsongrass was greater with glufosinate at 590 and 740 g ai ha−1 than at 450 g ha−1. Sequential glufosinate applications were more effective than a single application, irrespective of rate. A PRE application of flumioxazin at 71 g ai ha−1 immediately after planting provided no more than 26% johnsongrass control 6 wk after soybean emergence (WAE). The addition of clethodim at 136 g ai ha−1 to sequential applications of glufosinate at 450 g ha−1 improved control over sequentially applied glufosinate alone. Herbicide programs containing imazethapyr or imazamox in combination with glufosinate followed by clethodim plus glufosinate controlled johnsongrass at least 94% at 10 WAE and provided three distinct mechanisms of action, a highly effective resistance management strategy. Results from this research indicate that a high level of glyphosate-resistant johnsongrass control can be achieved through the use of several herbicide options in glufosinate-resistant soybean.

En 2010 y 2012, se realizaron tres experimentos en campos de producción de soya cerca de Memphis Oeste, AR, que tenían Sorghum halepense resistente a glyphosate. El objetivo de esta investigación fue desarrollar programas efectivos de herbicidas para el control de S. halepense resistente a glyphosate en soya resistente a glufosinate. El control de S. halepense resistente fue mayor con glufosinate a 590 y 740 g ai ha−1 que a 450 g ha−1. Aplicaciones secuenciales de glufosinate fueron más efectivas que aplicaciones sencillas, independientemente de la dosis. Una aplicación PRE de flumioxazin a 71 g ai ha−1 inmediatamente después de la siembra brindó no más de 26% control de S. halepense, 6 semanas después de la emergencia de la soya (WAE). La adición de clethodim a 136 g ai ha−1 a las aplicaciones secuenciales de glufosinate a 450 g ha−1 mejoraron el control en comparación con las aplicaciones secuenciales de glufosinate solo. Los programas de herbicidas que contenían imazethapyr o imazamox en combinación con glufosinate seguido de clethodim más glufosinate controlaron S. halepense en al menos 94% a 10 WAE y brindaron tres modos de acción distintos, lo que es una estrategia altamente efectiva para el manejo de resistencia. Los resultados de esta investigación indican que se puede alcanzar un alto nivel de control de S. halepense resistente a glyphosate mediante el uso de varias opciones de herbicidas en soya resistente a glufosinate.

Keywords

Clethodimflumioxazinfomesafenglufosinateglyphosateimazamoximazethapyrjohnsongrass, Sorghum halepense (L.) Perssoybean, Glycine max (L.) MerrGlufosinate resistanceresistance managementweed control
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 1 , March 2014 , pp. 10 - 18
Copyright
Copyright © Weed Science Society of America 

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