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Title:The Interaction of Bentazon and Haloxyfop-Methyl or Sethoxydim
Author(s):Williams, Charles Steven
Department / Program:Agronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Agronomy
Abstract:The purpose of this study was to determine the efficacy of haloxyfop-methyl {methyl 2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy)propanoate} or sethoxydim {2-(1-(ethoxyimino)butyl)-5-(2-(ethylthio)propyl)-3-hydroxy-2-cyclohexen-1-one} when tank-mixed with bentazon {3-isopropyl-1H-2, 1,3-benzothiadiazin-4(3H)-one 2,2-dioxide} through field and greenhouse experiments. In addition, laboratory experiments were conducted in order to provide more information on the basis of the postemergence grass herbicide by bentazon interaction.
Field experiments indicated that bentazon antagonizes both haloxyfop-methyl and sethoxydim activity when applied in tank-mix combination as measured through giant foxtail (Setaria faberii Herrm.) control. The reduction in activity of the grass herbicides when tank-mixed with bentazon was found to depend on both the grass herbicide rate and the bentazon rate in the tank-mix solution. Antagonism increased as the grass herbicide rate decreased or the bentazon rate increased within the tank-mix solution.
Analysis of the haloxyfop-methyl plus bentazon tank-mix solution indicated that the herbicides were compatible within the solution. Degradation of either herbicide or complexing of the two herbicides was not apparent.
('14)C-haloxyfop-methyl and ('14)C-sethoxydim uptake by foxtail millet {Setaria italica (L.) P. Beauv.} and common cocklebur (Xanthium pensylvanicum Wallr.) was inhibited when bentazon was added to each ('14)C grass herbicide treatment emulsion. While the concentration of ('14)C was not always statistically different among plant parts when comparing either ('14)C-haloxyfop-methyl or ('14)C-sethoxydim alone with each respective tank-mix combination with bentazon, a trend was observed that bentazon inhibits the rate of absorbed ('14)C translocation from the treated leaf of foxtail millet and common cocklebur.
Bentazon did not affect the rate of haloxyfop-methyl hydrolysis on the foxtail millet leaf surface or within the plant.
A reduction in ('14)C-haloxyfop-methyl or ('14)C-sethoxydim penetration of the foxtail millet leaf was observed when each ('14)C grass herbicide was tank-mixed with either commercially formulated bentazon or technical grade bentazon.
('14)C-haloxyfop-methyl or ('14)C-sethoxydim applied sequentially to foxtail millet following an application of bentazon resulted in a reduction of ('14)C penetration equivalent to that of each respective tank-mix application with bentazon.
Issue Date:1984
Description:157 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
Other Identifier(s):(UMI)AAI8502343
Date Available in IDEALS:2014-12-16
Date Deposited:1984

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