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1 September 2013 Glyphosate-Resistant Giant Ragweed ( Ambrosia trifida) Control with Glufosinate or Fomsafen Combined with Growth Regulator Herbicides
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Abstract

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.

Nomenclature: DAA; days after application; GR; glyphosate resistant; giant ragweed; Ambrosia trifida L.

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.

Kelly A. Barnett, Thomas C. Mueller, and Lawrence E. Steckel "Glyphosate-Resistant Giant Ragweed ( Ambrosia trifida) Control with Glufosinate or Fomsafen Combined with Growth Regulator Herbicides," Weed Technology 27(3), 454-458, (1 September 2013). https://doi.org/10.1614/WT-D-12-00155.1
Received: 25 October 2012; Accepted: 1 March 2013; Published: 1 September 2013
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