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Incidence and yield losses in three cowpea varieties due to the leaf beetle, Ootheca mutabilis Sahl

Published online by Cambridge University Press:  19 September 2011

Michael O. Ashamo
Michael O. Ashamo
Affiliation:
Department of Biology, Federal University of Technology Akure, Nigeria E-mail: [email protected]
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Abstract

Screen house studies on the incidence and yield losses in three cowpea (Vigna unguiculata) varieties, TV × 3236, Ife Brown and Ife Bimpe due to the leaf beetle Ootheca mutabilis Sahl were carried out. Artificial infestation was done at two growth stages of cowpea: the 5-leaf stage (2 weeks after emergence) and 4 weeks after emergence. Variety TV×3236 was found to be the least susceptible, while var. Ife Bimpe was the most susceptible to leaf beetle damage. Young plants were more susceptible than older ones.

Flowering was delayed in plants infested with beetles and the extent of defoliation had a pronounced effect on the yield of cowpea.

The percentage grain yield loss ranged from 19.48% to 59.77% depending on level of beetle infestation, variety and age of the plant at infestation.

Résumé

Des études ont été menées en serres de criblage, afin de déterminer l'incidence et la perte en rendements chez trois variétés (TV×3236, Ife Brown et Ife Bimpe) de niébé (Vigna unguiculata), suite à l'attaque parla chrysomèle mineuse des feuilles, Ootheca mutabilis Sahl. (Coleoptera: Chrysomelidae). L'infestation artificielle des plantes a été faite à deux différentes périodes de croissance du niébé: à 2 et à 4 semaines après la levée. La variété TV×3236 était la plus résistante, tandis que la variété Ife Bimpe fut la plus sensible à l'attaque due au coléoptère. Les jeunes plants étaient plus sujets à l'attaque que ceux à l'âge avancé, peu importe la variété. La floraison était retardée chez les plants attaqués et l'importance de la défoliation avait un effet marqué sur les rendements du niébé.

Keywords

leaf beetleOotheca mutabiliscowpeasusceptibilityyield lossdefoliationchrysomèle mineuse des feuillesOotheca mutabilisniébésensibilitépertes en rendementsdéfoliation
Type
Short Communication
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 3 , September 1998 , pp. 257 - 260
Copyright
Copyright © ICIPE 1998

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