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Glyphosate-Resistant Giant Ragweed (Ambrosia trifida) Control with Glufosinate or Fomsafen Combined with Growth Regulator Herbicides

Published online by Cambridge University Press:  20 January 2017

Kelly A. Barnett
University of Tennessee, Department of Plant Sciences, 605 Airways Blvd., Jackson, TN 38301
Thomas C. Mueller
University of Tennessee, Department of Plant Sciences, 252 Ellington Plant Sciences Building, 2431 Joe Johnson Dr., Knoxville, TN 37996
Lawrence E. Steckel*
University of Tennessee, Department of Plant Sciences, 605 Airways Blvd., Jackson, TN 38301
Corresponding author's Email:


The development of crops resistant to 2,4-D, dicamba, and glufosinate may provide new options for the management of glyphosate-resistant (GR) giant ragweed and other herbicide-resistant weeds. A fallow field study was conducted in 2011 and 2012 to determine the control of GR giant ragweed with 2,4-D and dicamba applied alone and in combination with glufosinate or fomesafen. Dicamba and 2,4-D tank-mixed with glufosinate or fomesafen provided the highest level of control at 10 or 20 days after application (DAA). At 30 DAA, all herbicide treatments provided > 88% control of giant ragweed except glyphosate, glufosinate, and 2,4-D alone at 0.56 kg ae ha−1. Glyphosate, glufosinate, and 2,4-D alone at 0.56 kg ae ha−1 also had the highest number of giant ragweed plants (> 5.8 plants m−2) and highest biomass (> 19.2 g m−2). Contrast statements between 2,4-D and dicamba indicated no differences among treatments containing these herbicides. However, contrast analysis indicated that herbicides applied alone resulted in 56, 58, and 61% control while tank-mix combinations of 2,4-D or dicamba with glufosinate or fomesafen resulted in 86, 91, and 93% control, respectively. Herbicides applied alone also had more giant ragweed plants and biomass per m−2 than herbicides applied in tank-mix combinations. Tank-mixing combinations of 2,4-D and dicamba will be important for effective control of GR giant ragweed.

El desarrollo de cultivos resistentes a 2,4-D, dicamba, y glufosinate podría brindar nuevas opciones para el manejo de Ambrosia trifida resistente a glyphosate (GR) y de otras malezas resistentes a herbicidas. En 2011 y 2012, se realizó un estudio de campo en barbecho para determinar el control de A. trifida GR con 2,4-D y dicamba aplicados solos y en combinación con glufosinate o fomesafen. Dicamba y 2,4-D en mezcla en tanque con glufosinate o fomesafen brindaron el mayor nivel de control a 10 ó 20 días después de la aplicación (DAA). A 30 DAA, todos los tratamientos de herbicidas brindaron >88% de control de A. trifida excepto glyphosate, glufosinate, y 2,4-D solos a 0.56 kg ae ha−1. Glyphosate, glufosinate, y 2,4-D solos a 0.56 kg ae ha−1 también tuvieron el mayor número de plantas de A. trifida (>5.8 plantas m−2) y la mayor biomasa (19.2 g m−2). Pruebas de contraste entre 2,4-D y dicamba indicaron que no hubo diferencias entre tratamientos que contenían estos herbicidas. Sin embargo, el análisis de contrastes indicó que los herbicidas aplicados solos resultaron en 56, 58, y 61% de control mientras que las combinaciones de mezcla en tanque de 2,4-D o dicamba con glufosinate o fomesafen resultaron en 86, 91, y 93% de control, respectivamente. Los herbicidas aplicados solos también tuvieron más plantas y mayor biomasa de A. trifida por m−2 que los tratamientos con combinaciones de mezcla en tanque. Las combinaciones de mezcla en tanque de 2,4-D y dicamba serán importantes para el control efectivo de A. trifida GR.

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

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