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Effect of Adjuvant on Foliar Absorption and Activity of Clethodim and Polar Degradation Products of Clethodim

Published online by Cambridge University Press:  12 June 2017

David C. Bridges ,
Albert E. Smith  and
Linford N. Falb
David C. Bridges
Affiliation:
Dep. Agron., Univ. Georgia, Griffin, GA 30223-1797
Albert E. Smith
Affiliation:
Dep. Agron., Univ. Georgia, Griffin, GA 30223-1797
Linford N. Falb
Affiliation:
Dep. Agron., Univ. Georgia, Griffin, GA 30223-1797
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Abstract

Research was conducted to determine foliar absorption of 14C-clethodim and its polar degradation products with five adjuvants and to compare the relative herbicidal activity of clethodim and its polar degradation products. Differential 14C-clethodim and 14C-polar degradation products absorption occurred among the five adjuvants. Adjuvants that mediated rapid foliar absorption of clethodim did not always mediate rapid foliar uptake of polar degradation products. Herbicidal activity of clethodim exceeded activity of polar degradation products regardless of time of day of application or whether adjuvant was used. Inclusion of adjuvant was required for herbicidal activity of polar degradation products. Clethodim activity declined when applied at 0800 h EDT compared to applications at 2000 h EDT. To maximize herbicidal activity of clethodim, adjuvants should be selected that mediate rapid foliar absorption of both clethodim and the polar degradation products of clethodim and that minimize photodegradation of clethodim.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onegrain sorghum, Sorghum bicolor L. ‘Pioneer 8333′Uptakepenetrationsurfactantcrop oilphotodegradationgraminicidegrain sorghumSorghum bicolor
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 39 , Issue 4 , December 1991 , pp. 543 - 547
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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