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Adjuvant and pH Effects on Sethoxydim and Clethodim Activity on Rhizome Johnsongrass (Sorghum halepense)

Published online by Cambridge University Press:  12 June 2017

David C. Bridges
David C. Bridges*
Affiliation:
Dep. Agron., Univ. Ga., Griffin, GA 30223-1797
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Abstract

Rhizome johnsongrass control with sethoxydim and clethodim was evaluated with the addition of three adjuvants: Agrioil3, BAS8153, and Li7003. Johnsongrass control was similar with the three adjuvants when either sethoxydim or clethodim was applied alone, but when bentazon was added, johnsongrass control declined with both sethoxydim and clethodim. Control generally declined less with BAS815 than with Agrioil or Li700, but the addition of BAS815 did not completely reverse the effects of adding bentazon to sethoxydim or clethodim. Johnsongrass control was not affected by adjusting pH when sethoxydim or clethodim was applied with bentazon and Agrioil. Johnsongrass control over a pH range of 3.5 to 6.5 via the addition of glacial acetic acid and calcium hydroxide or ammonium hydroxide indicated a lack of pH dependence for these herbicides. The addition of ammonium hydroxide resulted in slight, but inconsistent increases in johnsongrass control.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4-(3H)-one 2,2-dioxide;clethodim (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onesethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onejohnsongrass, Sorghum halepense (L.)Pers. ♯4 SORHAPetroleum oil concentratecrop oil concentrateBAS815antagonismammonium ionsalkaline hydrolysis
Type
Research
Information
Weed Technology , Volume 3 , Issue 4 , December 1989 , pp. 615 - 620
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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