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Fluridone and Encapsulated Acetochlor Reduce Protoporphyrinogen Oxidase Inhibitor Use in a Glufosinate-Based Palmer Amaranth Management Program for Cotton
Published online by Cambridge University Press: 23 February 2017
Abstract
Flumioxazin and fomesafen are commonly used to control glyphosate-resistant Palmer amaranth in cotton and other crops, thus increasing risk to select for Palmer amaranth biotypes resistant to protoporphyrinogen oxidase (PPO) inhibitors. A field experiment was conducted to determine the potential for fluridone and acetochlor to substitute for soil-applied PPO inhibitors in a Palmer amaranth management system with glufosinate applied twice POST and diuron plus MSMA POST-directed in conservation tillage cotton. Fluridone and flumioxazin applied preplant 23 to 34 d prior to planting were similarly effective. Fluridone and acetochlor plus diuron applied PRE controlled Palmer amaranth as well as fomesafen plus diuron PRE. All systems with preplant and PRE herbicides followed by glufosinate POST and diuron plus MSMA layby controlled Palmer amaranth well. Cotton yield did not differ among herbicide treatments. This research demonstrates that fluridone and acetochlor can substitute for soil-applied PPO-inhibiting herbicides in management systems for Palmer amaranth.
Flumioxazin y fomesafen son usados comúnmente para controlar Amaranthus palmeri resistente a glyphosate en algodón y otros cultivos, lo que incrementa el riesgo de seleccionar biotipos resistentes de A. palmeri a inhibidores de protoporphyrinogen oxidase (PPO). Se realizó un experimento de campo para determinar el potencial de fluridone y acetochlor para sustituir inhibidores de PPO aplicados al suelo en sistemas de manejo de A. palmeri con glufosinate aplicado dos veces POST y diuron más MSMA aplicados POST-dirigido en algodón bajo labranza de conservación. Fluridone y flumioxazin aplicados 23 y 34 d antes de la siembra fueron similarmente efectivos. Fluridone y acetochlor más diuron aplicados PRE controlaron A. palmeri tan bien como fomesafen más diuron PRE. Todos los sistemas con herbicidas en presiembra y PRE seguidos por glufosinate POST y diuron más MSMA POST-dirigido controlaron A. palmeri bien. El rendimiento del algodón no difirió entre tratamientos de herbicidas. Esta investigación demuestra que fluridone y acetochlor pueden sustituir herbicidas inhibidores de PPO aplicados al suelo en sistemas para el manejo de A. palmeri.
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- Research Article
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- Copyright © Weed Science Society of America
Footnotes
Current address: Graduate Research Assistant, Department of Entomology, North Carolina State University, Raleigh, NC 27695-7616.
Current address: Assistant Professor, Department of Plant Pathology, Physiology, and Weed Science, Eastern Shore Agricultural Research and Extension Center, Painter, VA 23420-2826.
Associate editor for this paper: Daniel Stephenson, Louisiana State University Agricultural Center.
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