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Laboratory Evaluation of Piper guineense for the Protection of Cowpea Against Callosobruchus maculatus

Published online by Cambridge University Press:  19 September 2011

Julius I. Olaifa  and
Wilson O. Erhun
Julius I. Olaifa
Affiliation:
Department of Plant Science, University of Ife, Ile-Ife, Nigeria
Wilson O. Erhun
Affiliation:
Department of Pharmacognosy, University of Ife, Ile-Ife, Nigeria
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Abstract

The efficacy of the powder and volatile oil of Piper guineense Schum & Thonn at protecting cowpea against seed beetle, Callosobruchus maculatus (F.) was tested in the laboratory. At low concentrations the powder significantly reduced oviposition and adult emergence while oviposition was completely suppressed at a higher concentration of 42%. The same concentration provided adequate protection for the same amount of cowpea placed in containers of different volumes. The powder, however, did not show any fumigant effect. Volatile oil at 0.002 and 0.005% significantly reduced oviposition and adult emergence, while oviposition was completely suppressed at 0.02% and above. Weight loss of seeds at 90 days after treatment with volatile oil decreased as concentration of the oil increased. The practical significance of the results in small scale storage of cowpea is discussed.

Résumé

L'efficacite du poudre et de l'huile volatile de Piper guineense à la protection du pois contre la bruche des pois Callosobruchus maculatus a été mise ' l'épreuve au laboratoire. A des basses concentrations, le poudre a reduit d'une maniere significative l'oviposition et l'émergence de l'adulte tandis qu'il y a eu une surpression de l'oviposition a une concentration de 42%. Cette meme concentration à fourni une protection surrtsante pour la meme quantité du pois placeé dans des recipients de volumes diverses. Toutefois, le poudre na mantre aucum effect de famigant. A des concentration de 0.002% et 0.005% de l'huile volatile, on remarque une forte baisse de l'oviposition et l'emergence de l'adulte suivi d'une suppression complete de l'oviposition a 0.02% et a des concentrations superieures a une concentration de 0.02% et au dessus.

Want a la perte en poids des grains, on note qu'a 90 jours suivant le traitement a l'huile volatile il y a une diminution de celle-ci quand la concentration de l'huile augmente. La mise en pratique des resultatss pour la conservation, à petite echelle, de pois est discuteé.

Keywords

Piper guineenseCallosobruchus maculatusprotectionovipositionadult emergencevolatile oilPiper guineenseCallosobruchus maculatusprotectionl'ovipositionl'emergence de l'adultel'huile volatile
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 55 - 59
Copyright
Copyright © ICIPE 1988

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References

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