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Fumigant effects of some volatile oils on fecundity and adult emergence of Callosobruchus maculatus F.

Published online by Cambridge University Press:  19 September 2011

A. A. Gbolade  and
T. A. Adebayo
A. A. Gbolade
Affiliation:
Department of Pharmacognosy, Obafemi Awolowo University, Ile-Ife, Nigeria
T. A. Adebayo
Affiliation:
Department of Plant Science, Obafemi Awolowo University, Ile-Ife, Nigeria
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Abstract

We tested the effectiveness of volatile oils of Lippia adoensis Hoschst, Cymbopogon citratus (DC) Stapf., Eugenia uniflora L., Lantana camara L., and Chromolaena odorata (L.) King and Robinson at a dose range of 5 to 50 p.1 in protecting 9.9 g (50 seeds) of stored cow pea from infestation by the cowpea weevil, Callosobruchus maculatus F. The effectiveness of the oils as fumigants ranked as follows: L. adoensis > C. citratus > E. uniflora. Oils of L. camara and C. odorata were unsuitable for fumigation purposes. At doses of 5 to 20 μl, oil of L. adoensis protected cowpea from weevil attack. At 5 μl, volatile oil of L. adoensis was as effective as 20 μ1 each of E, uniflora and C. odorata, and only slightly inferior to C. citratus. Insecticidal activity of L. adoensis against C. maculatus was unequalled by any other oils tested. The effective doses of these oils did not impair the viability of treated cowpea.

Résumé

Nous avons testé l'efficacité des huiles volatiles de Lippia adoensis Hoschst, Cymbopogon citratus (DC) Stapf., Eugenia uniflora L., Lantana camara L., et Chromolaena odorata (L.) King et Robinson avec des doses allant de 5 % à 50 μ1 pour protéger 9.9 g (50 graines) de niébé stocke de l'infestation des charancons du niébé, Callosobruchus maculatus F. Le degré d'efficacité des huiles pour la fumigation a donné, dan l'ordre décroissant: L. adoensis >; C. citratus > E. uniflora. Les huiles de L. camara et C. odorata n'etaient pas appropriées à la fumigation. Une dose de 5 à 20 μl d'huile deL. adoensis protége le niébé de l'infestation de charancons. Une dose de 5 μ1 d'huile de L. adoensis était aussi efficace qu'une dose de 20 μl de E. uniflora ou de C. odorata, et seulement légèrement moins efficace que C. citratus. L'activité insecticide de L. adoensis contre C. maculatus est restée inégalée, avec toutes les autres huiles testées. L'effïcacité des doses de ces huiles n'a pas réduit la viabilite du niébé traité.

Keywords

Cymbopogon citratusEugenia unifloraLippia adoensisCallosobruchus maculatusvolatile oilfumigationovipositionadult emergenceCymbopogon citratusEugenia unifloraLippia adoensisCallosobruchus maculatusl'huile volatilefumigationl'ovipositionl'emergence de l'adulte
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 5-6 , December 1993 , pp. 631 - 636
Copyright
Copyright © ICIPE 1993

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