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Corn earworm infestation of seven maize cultivars and control in south-western Nigeria

Published online by Cambridge University Press:  19 September 2011

Ajibola M. Daramola
Ajibola M. Daramola
Affiliation:
Institute of Agricultural Research and Training, University of Ife, P.M.B. 5029, Moor Plantation, Ibadan, Nigeria
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Abstract

The corn earworm damage to seven maize cultivars TZB, TZPB, WYI, 096EP6, Farz 25, ‘Kewesoke’ and Local White, was assessed during the early and late cropping seasons of 1980 and 1981 at Ikenne and Ilora located in the rain-forest and derived savanna zones, respectively. The effectiveness of dimethoate and permethrin in controlling the earworms was evaluated. All the cultivars appeared susceptible to earworm infestation in the two ecological zones. Infestation was consistently and significantly higher in the early season and also in the rain-forest zone. It ranged from 71.5 to 86% in the early and from 28 to 36.8% in the late seasons, respectively, at Ikenne. At Ilora, infestation ranged from 53 to 82% and from 20 to 75% in the early and late seasons, respectively. Mussidia nigrivenella and Heliolhis armigera were the dominant species recorded damaging the grains.

Earworm infestation was significantly lower on plots treated wtih three applications of 0.05 and 0.1% a.i. permethrin at weekly intervals than on plots that received the same dosages and sprays of dimethoate and the control. Maize yields were significantly higher on permethrin-treated plots. The lower dosage of permethrin is recommended to reduce chemical residue on maize grains.

Résumé

Pendant les saisons précose at dernier dans les ans 1980 et 1981, le degat qui les grains lombrics causent au sept mais cultivars, TZB, TZPB, WYI, 096EP6, Farz 25, Kewesoke et Blanc Local a estimé dans la zone forêt pluie à Ikenne et à la zone Savannah derive a Ilora. L'effet vigueur des dimethoate et permethrin à diriger les lombri à estimé. Tous les cultivars ont apparu sensible au infestation lombric dans les deux zones écologiques. L'infestation a été fort significant pendant la saison précose et dans la zone forêt plute aussi. Il a rangé de pour cent 72,5 à 80 dans la saison précose et de pour cent 28 à 36,8 dans la saison dernière à Ikenne et Ilora respectifment. Mussidia nigrivenella et Heliothis armigera é taient species dominates parmi les lombrics qui c'endommagaient les grains.

L'infestation lombric etait plus bas significantment sur les terrains qui s'ont appliqué les trois doses des 0,05 et 0,1 pour cent'du permethrin par semaine intervalle quelles terraine qui s'ont appliqué les mêmes dosages et atomiseurs de dimethoate. Les rendement des mais étaient plus grand significantment sur les terrains qui s'ont appliqué de permethrin. La dosage plus bas de permethrin c'est recommandé pour la crainte du résidu chimique sur les grains mais.

Keywords

Corn earwormMussidia nigrivenellaHeliothis armigeradimethoatepermethrincontrolLes grain lombricsMussidia nigrivenellaHeliothis armigeradimethoatepermethrincontrol
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 1 , February 1986 , pp. 49 - 52
Copyright
Copyright © ICIPE 1986

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