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Basis for Antagonism in Mixtures of Bromoxynil Plus Quizalofop-P Applied to Yellow Foxtail (Setaria glauca)

Published online by Cambridge University Press:  12 June 2017

A. Stanley Culpepper ,
Alan C. York ,
David L. Jordan ,
Frederick T. Corbin  and
Yvonna S. Sheldon
A. Stanley Culpepper
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
Alan C. York*
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
David L. Jordan
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
Frederick T. Corbin
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
Yvonna S. Sheldon
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: alan_york@ncsu.edu.
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Abstract

Antagonism of quizalofop-P efficacy on annual grasses by bromoxynil has been noted in both the field and greenhouse. Laboratory experiments were conducted on yellow foxtail (Setaria glauca) to determine the effect of mixing bromoxynil with the ethyl ester of quizalofop-P on absorption, translocation, and metabolism of 14C-quizalofop-P Applying bromoxynil in mixture with quizalofop-P reduced 14C-label absorption from 63 to 51%, 73 to 52%, 77 to 68%, and 90 to 80% at 4, 8, 24, and 96 h after treatment, respectively. Translocation of 14C-label from the treated leaf into the shoot above or shoot below was unaffected by bromoxynil. However, translocation into the roots was reduced from 0.9 to 0.4% and 1.0 to 0.5% at 4 and 8 h after treatment, respectively, but differences were not noted at 0.5, 1, 24, and 96 h after treatment. Bromoxynil increased deesterification of quizalofop-P-ethyl into quizalofop-P acid from 45 to 60% in the shoot above the treated leaf. However, bromoxynil did not affect metabolism of quizalofop-P in the treated leaf or shoot below the treated leaf. These results suggest that antagonism of quizalofop-P activity by bromoxynil is primarily due to decreased absorption of quizalofop-P, whereas effects on translocation and metabolism were minor.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrilequizalofop-P, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidyellow foxtail, Setaria glauca (L.) Beauv. # SETLUAcetyl-coenzyme A carboxylase14Cherbicide absorptionherbicide interactionherbicide metabolismherbicide translocationSETLUAPP, aryloxyphenoxypropionic acidLSS, liquid scintillation spectrometryPOST, postemergenceTLC, thin-layer chromatography
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 515 - 519
Copyright
Copyright © 1999 by the Weed Science Society of America 

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