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The Potential of Neem Azadirachta Indica A. Juss. for Controlling Post-Flowering Pests of Cowpea, Vigna Unguiculata Walp—I. The Pod Borer, Maruca Testulalis

Published online by Cambridge University Press:  19 September 2011

L. E. N. Jackai  and
I. O. Oyediran
L. E. N. Jackai
Affiliation:
International Institute of Tropical Agriculture, P. M. B. 5320, Oyo Road, Ibadan, Nigeria
I. O. Oyediran
Affiliation:
International Institute of Tropical Agriculture, P. M. B. 5320, Oyo Road, Ibadan, Nigeria
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Abstract

Neem oil (NO), and different formulations of neem oil in a solution of Tetrapleura tetraptera as emulsifier, including neem oil emulsifiable concentrate (NOEC), neem oil slurry emulsifiable concentrate (NOSEC) and 5% NOEC obtained from the seeds of the neem plant, were tested for their efficacy in the control of Maruca testulalis Geyer, under laboratory conditions using flowers of Ife Brown, cowpea variety.

The different concentrations of NOEC (5, 10 and 20%) exhibited a high degree of insecticidal activity on M. testulalis larvae. All the treated flowers were protected from larval damage 2 days after treatment as compared to the 100% damage recorded on untreated flowers and on the flowers treated with T. tetraptera solution alone.

The NOSEC and the 5% NOEC prepared using different volumes of the emulsifier also exhibited some insecticidal activity which decreased with a decrease in concentration. NO/NOEC were superior to NOSEC and the 5% NOEC prepared in different volumes of the emulsifier.

Résumé

L'effet insecticide ainsi que les méchanismes inhibitifs de l'alimentation des insectes présentés par des produits naturels, dérivés essentiellement d'huile de nim (HN), on été testés au laboratoire sur Maruca testulalis, un ravageur important de la post-floraison du nièbé. Il s'agit de concentrés émulsifiables d'huile de nim (CEHN), de concentrés emulsifiables à base de bouillie d'huile de nim (CEBHN) et de CEHN à 5%, préparé dans différentes concentrations d'une solution de Tetrapleura tetraptera (émulsifiant). Les fleurs de la variété améliorée Ife Brown ont été utilisée pour cette étude.

Les différentes concentrations de CEHN testées (5, 10 et 20%) ont eu un effet inhibitif prononcé sur les larves de M. testulalis. Deux jours après le traitement, toutes les feuilles traitées étaient exemptes de dégâts par Maruca testulalis contre 100% de déprédation chez le témoin (fleurs non traitées) et les fleurs traitées avec la solution de T. tetraptera.

Un certain degré d'activité insecticide a également été observé après la pulvérisation de concentrés émulsifiables à base de bouillie d'huile de nim (CEBHN) et de CEHN à 5% dans différentes concentrations d'émulsifiant.

Toutefois, l'activitié insecticide de ces deux produits faiblissait au fur et à mesure que leur concentration diminuait.

Cette étude a mis en lumière la supériorité de HN/CEHN par rapport au CEBHN et au CEHN à 5% préparé dans différentes concentrations d'émulsifiant.

Keywords

Neem oilneem oil emulsifiable concentrateneem oil slurry emulsifiable concentrateTetrapleura tetrapteraemulsifierMaruca testulalis
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 12 , Issue 1-2-3: Current Topics in Tropical Entomology , June 1991 , pp. 103 - 109
Copyright
Copyright © ICIPE 1991

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