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A Basis for the Antagonistic Effect of 2,4-D on Haloxyfop-Methyl Toxicity to Johnsongrass (Sorghum halepense)

Published online by Cambridge University Press:  12 June 2017

Thomas C. Mueller ,
Michael Barrett  and
William W. Witt
Thomas C. Mueller
Affiliation:
Dep. Agron., Univ. Kentucky; Lexington, KY 40546-0091
Michael Barrett
Affiliation:
Dep. Agron., Univ. Kentucky; Lexington, KY 40546-0091
William W. Witt
Affiliation:
Dep. Agron., Univ. Kentucky; Lexington, KY 40546-0091
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Abstract

Haloxyfop-methyl toxicity to johnsongrass was reduced when sprayed in combination with 2,4-D in greenhouse studies. The antagonism was not seen when 2,4-D application followed haloxyfop-methyl treatment by 72 h or preceded it by 24 h. The antagonism of haloxyfopmethyl activity was evident regardless of chemical form of 2,4-D used (DMA, BOE ester, IPA, or acid). Absorption of 14C-haloxyfop-methyl into johnsongrass leaves was slowed by the presence of 2,4-D in the treatment solution but total absorption after 72 h was not affected. Translocation of 14C was decreased when the 14C-haloxyfop-methyl was applied in combination with 2,4-D. More haloxyfop-methyl, less haloxyfop, and more ether-soluble haloxyfop-methyl metabolites were found in treated leaves when haloxyfop-methyl was applied with 2,4-D compared to haloxyfop-methyl applied alone. The changes in haloxyfop-methyl translocation and metabolism caused by 2,4-D can quantitatively account for the antagonism observed.

Keywords

Haloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl) - 2 - pyridinyl]oxy]phenoxy]propanoic acid2,4-D, 2,4-dichlorophenoxyacetic acidhaloxyfop-methyl, methyl ester of haloxyfopDMA, dimethylamine saltBOE ester, butoxyethyl esterIPA, isopropylamine saltjohnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAUptaketranslocationmetabolismtank mixtureSORHA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 2 , March 1990 , pp. 103 - 107
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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