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Biokinetics and Efficacy of Aminocyclopyrachlor-Methyl Ester as Influenced by Diflufenzopyr

Published online by Cambridge University Press:  20 January 2017

Jose J. Vargas ,
James T. Brosnan ,
Thomas C. Mueller ,
Dean A. Kopsell ,
William E. Klingeman  and
Gregory R. Armel
Jose J. Vargas*
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
James T. Brosnan
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Thomas C. Mueller
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Dean A. Kopsell
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
William E. Klingeman
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Gregory R. Armel
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
*
Corresponding author's E-mail: [email protected]
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Abstract

Research studies evaluated effects of the auxin transport inhibitor, diflufenzopyr, on the biokinetics and efficacy of aminocyclopyrachlor-methyl ester (AMCP-ME) applications to black nightshade and large crabgrass. Absorption, translocation, and metabolism of 14C-AMCP-ME was quantified with and without diflufenzopyr (35 g ai ha−1). Diflufenzopyr had minimal effects on translocation of radioactivity in either species. Accumulation of radioactivity in aboveground plant sections of black nightshade was greater than or equal to that in large crabgrass by 72 h after treatment (HAT). In both species, metabolism of 14C-AMCP-ME was rapid, as 60 to 78% of the extracted radioactivity was the free acid metabolite 8 HAT. In the greenhouse, black nightshade and large crabgrass were treated with AMCP-ME (9, 18, and 35 g ai ha−1) alone and in combination with diflufenzopyr (35 g ha−1). Mixtures of AMCP-ME plus diflufenzopyr did not increase large crabgrass control compared with AMCP-ME alone at any time. Diflufenzopyr (35 g ha−1) increased black nightshade control with AMCP-ME (18 and 35 g ha−1) 7 d after treatment (DAT). However, this increase in control was not observed 14 or 28 DAT. All treatments containing AMCP-ME controlled large crabgrass 70 to 79% 28 DAT compared with > 93% for black nightshade at the same time point.

Keywords

Aminocyclopyrachloraminocyclopyrachlor-methyl esterdiflufenzopyrblack nightshade, Solanum nigrum L.large crabgrass, Digitaria sanguinalis (L.) Scop.Absorptionauxin mimic herbicideauxin transport inhibitormetabolismradiolabeled herbicidetranslocation
Type
Weed Management
Information
Weed Science , Volume 62 , Issue 3 , September 2014 , pp. 538 - 547
Copyright
Copyright © Weed Science Society of America 

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