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Rimsulfuron for Postemergence Weed Control in Corn in Humid Tropical Environments of Nigeria

Published online by Cambridge University Press:  20 January 2017

David Chikoye ,
Udensi E. Udensi ,
A. Fontem Lum  and
Friday Ekeleme
David Chikoye*
Affiliation:
International Institute of Tropical Agriculture, Ibadan, Nigeria
Udensi E. Udensi
Affiliation:
International Institute of Tropical Agriculture, Ibadan, Nigeria
A. Fontem Lum
Affiliation:
International Institute of Tropical Agriculture, Ibadan, Nigeria
Friday Ekeleme
Affiliation:
Michael Okpara University, Umudike, Abia State
*
Corresponding author's E-mail: d.chikoye@cgiar.org
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Abstract

Cogongrass and guineagrass are serious perennial weeds in small-scale farms in lowland subhumid zones of West Africa. Field studies were conducted in 2002 and 2003 at two sites in Ibadan, Nigeria [Ijaye and the International Institute of Tropical Agriculture (IITA)], to evaluate the effect of rimsulfuron on weed communities dominated by cogongrass and guineagrass in corn. At both sites, treatments were rimsulfuron dosages of 0 (nontreated control), 10, 20, 30, 40, 50, 60, 70, and 80 g ai/ha. Rimsulfuron did not cause any visible phytotoxicity on the corn at any dosage at either site. There was a rapid increase in weed control as the dosage of rimsulfuron increased from 0 to 20 g/ha. Weed control was not improved at rates higher than 20 g/ha. Rimsulfuron was very effective against sedges, Ipomoea involucrata, Bengal dayflower, gulf leafflower, old-world diamond-flower, and wild jute providing more than 80% control at dosages between 10 and 20 g/ha at Ijaye. Rimsulfuron was less effective for cogongrass, with a maximum of only 38% control observed. At IITA, the herbicide was very effective against guineagrass, Bengal dayflower, nodeweed, coat buttons, redfruit passionflower, and waterleaf; all of which were controlled more than 70% with any rate of rimsulfuron. Regression analysis showed that the dosage of rimsulfuron required to reduce shoot dry biomass by 70% was 5 g/ha for guineagrass and 35 g/ha for cogongrass at 3 wk after treatment (WAT). At crop maturity, the dosage of rimsulfuron required to reduce shoot dry biomass by 70% was 43 g/ha for guineagrass and 200 g/ha for cogongrass. The dry biomass of cogongrass and guineagrass was higher at crop harvest than at 2 WAT regardless of herbicide dosage. Corn grain yield was 1.8 times higher at IITA than at Ijaye. At both sites, corn grain yield increased with increased herbicide dosage. Maximum corn grain yields were obtained at a rimsulfuron dosage of 20 g/ha.

Keywords

Rimsulfuroncoat buttons, Tridax procumbens L. TRQPRcogongrass, Imperata cylindrica (L.) Beauv. IMPCYold-world diamond-flower, Oldenlandia corymbosa L. OLDCOguineagrass, Panicum maximum Jacq. PANMAgulf leafflower, Phyllanthus amarus Schum. & Thonn. PYLAMnodeweed, Synedrella nodiflora (L.) Gaertn SYDNOredfruit passionflower, Passiflora foetida L. PAQFOsedges, Cyperus, Mariscus, and Kyllinga sppBengal dayflower, Commelina benghalensis L. COMBEwaterleaf, Talinum triangulare (Jacq.) Willd TALTRwild jute, Corchorus tridens L. CRGTRcorn, Zea mays L. ‘TZL Comp 4W’Rhizomesulfonylureachemical control
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 977 - 981
Copyright
Copyright © Weed Science Society of America 

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