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Pesticidal potentials of tropical plants—I. Insecticidal activity in leaf extracts of sixty plants

Published online by Cambridge University Press:  19 September 2011

Lawrence A. D. Williams  and
Ajai Mansingh
Lawrence A. D. Williams
Affiliation:
Pesticide and Pest Research Group, Faculties of Natural and Medical Sciences, Department of Zoology, University of the West Indies, Kingston 7, Jamaica
Ajai Mansingh*
Affiliation:
Pesticide and Pest Research Group, Faculties of Natural and Medical Sciences, Department of Zoology, University of the West Indies, Kingston 7, Jamaica
*
* Dr. A. Mansingh, Department of Zoology, P.O. Box 12, University of the West Indies, Kingston 7, Jamaica.
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Abstract

Crude ethanol extracts (CE) of leaves of 60 plant species belonging to 32 families and 52 genera were bioassayed for toxicity to adult Tribolium confusum by spraying a 10% (w/v) concentrate under a Potter's tower. CE of eight plants had none and three had some bioactivity; 36 CE killed from 13 to 40% of the beetles. Thirteen plant extracts inflicted between 53 and 100% mortality in the following order: Azadirachta indica (53%) < Eupatorium odorantum = Gliricida sepium = Mimosa pudica (60%) < Annona reticulata = Hibiscus rosa sinensis (67%) < Cycloptis semicordata < Artocarpus altilis < Capsicum annum (90–97%) < Bontia daphnoides = Cuscuta americana = Dioscorea polygonoides = Nkotina tabacum (100%).

Résumé

Des extraits bruts d'éthanol provenant de feuilles de 60 espèces de plantes appartenant à 32 families et à 52 genres ont été soumises à des analyses biologiques destinées à déterminer leur toxicité à des Tribolium confusum adultes au moyen de pulvérisations sous tour potters d'un concentré de 10% (poids sur volume).

Les extraits de 8 plantes n'ont montré aucune bioactivité, alors que 3 ont montré activité; 36 extraits ont tué de 13 à 40% des scarabées. 13 extraits ont infligé une mortalité de 53 à 100 %. L'orde des plantes bioactives est le suivant: Azadirachta indica (53%) < Eupatorium odorantum = Gliricida sepium = Mimosa pudica (60%) < Annona reticulata = Hibiscus rosasinensis (67%) < Cycloptis semicordata < Artocarpus altilis < Capsicum annum (90–97%) < Bontia daphnoides = Cuscuta americana = Dioscorea polygonoides = Nicotina tabacum (100%).

Keywords

Botanical pesticidesplant extractsPesticides botaniquesextraits de plantes
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 5-6 , December 1993 , pp. 697 - 700
Copyright
Copyright © ICIPE 1993

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