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Weed Control in Cowpea (Vigna unguiculata) in the Humid Tropics

Published online by Cambridge University Press:  12 June 2017

I. Okezie Akobundu
I. Okezie Akobundu*
Affiliation:
Weed Sci., Intl. Inst. Trop. Agric., P.M.B. 5320, Ibadan, Nigeria
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Abstract

At least two weedings within the first 5 weeks after sowing are necessary to minimize yield reduction caused by weeds in cowpea [Vigna unguiculata (L.) Walp.]. During a 3-yr study, a preemergence application of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] at 2.0 to 3.0 kg/ha, DCPA (dimethyl tetrachloroterephthalate) at 10.0 kg/ha, or pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 2.0 or 2.5 kg/ha controlled most annual grasses effectively. Itchgrass (Rottboellia exaltata L.) was controlled with pendimethalin at 2.5 kg/ha, but metolachlor had no effect on this weed. These herbicides caused no crop injury and cowpea grain yield was as good as in the handweeded and weed-free plots. Alachlor [2-chloro-2′, 6′-diethyl-N-(methoxymethyl) acetanilide] applied preemergence at 2.0 kg/ha was effective against annual weeds, but was phytotoxic to cowpea.

Keywords

Rottboellia exaltataEuphorbia heterophyllachemical controlmetolachlorpendimethalin
Type
Research Article
Information
Weed Science , Volume 30 , Issue 4 , July 1982 , pp. 331 - 334
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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