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Control of Cowpea (Vigna unguiculata) in Soybean (Glycine max) with Acifluorfen

Published online by Cambridge University Press:  12 June 2017

Tim R. Murphy  and
Billy J. Gossett
Tim R. Murphy
Affiliation:
Agron. Dep., Clemson University, Clemson, SC 29631
Billy J. Gossett
Affiliation:
Agron. Dep., Clemson University, Clemson, SC 29631
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Abstract

Acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} applied 7 days after cowpea [Vigna unguiculata (L.) Walp.] emergence (unifoliolate leaf stage) gave better control than later applications. Cowpea control was obtained with one acifluorfen application at 7 days after cowpea emergence in 1981, but in 1980 and 1982, applications at 7 and 14 days were necessary for acceptable control (> 80%). Acifluorfen reduced cowpea plant dry weights relative to the weedy control. A single application 7 days after emergence reduced cowpea plant growth more than one at 21 days after emergence. Of all times of application, the greatest soybean [Glycine max (L.) Merr.] injury occurred when acifluorfen was applied at 7, 14, and 21 days after emergence, but seed yields were not reduced relative to the untreated weed-free control. There was no difference in response among three weedy cowpea cultivars to acifluorfen.

Keywords

Sequential acifluorfen applications
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 427 - 431
Copyright
Copyright © 1984 by the Weed Science Society of America 

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