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Effect of Adjuvant and Spray Volume on Quackgrass (Agropyron repens) Control with Selective Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

James J. Kells  and
Gunawan Wanamarta
James J. Kells
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Gunawan Wanamarta
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

Soybean-based [Glycine max (L.) Merr.] and petroleum-based crop oil concentrates were equally effective as spray adjuvants for control of quackgrass [Agropyron repens (L.) Beauv. #3 AGRRE] with the butyl ester of fluazifop {[±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acid} and sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one}. With favorable growing conditions at application in 1983 and 1985, an adjuvant concentration of 1% (v/v) with these herbicides was adequate for quackgrass control. Unfavorable growing conditions at application in 1984 resulted in unacceptable quackgrass control, and spray volume did not affect control. However, increasing the adjuvant concentration to 4% (v/v) with either herbicide applied in a spray volume of 70 L/ha nearly doubled quackgrass control. In 1983 and 1985, equal or greater quackgrass control with each herbicide was achieved with spray volumes as low as 35 L/ha compared to 280 L/ha.

Keywords

Adjuvant concentrationfluazifopsethoxydimsoybean oilcrop oil concentrateAGRRE
Type
Research
Information
Weed Technology , Volume 1 , Issue 2 , April 1987 , pp. 129 - 132
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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