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Toxicity and growth-inhibitory activity of Polygonum senegalense (Meissn.) surface exudate against Aedes aegypti larvae

Published online by Cambridge University Press:  19 September 2011

Nicholas K. Gikonyo ,
Richard W. Mwangi  and
J. Ogweno Midiwo
Nicholas K. Gikonyo
Affiliation:
Departments of Chemistry, and University of Nairobi P. O. Box 30197, Nairobi, Kenya
Richard W. Mwangi
Affiliation:
Departments of Zoology, University of Nairobi P.O. Box 30197, Nairobi, Kenya
J. Ogweno Midiwo*
Affiliation:
Departments of Chemistry, and University of Nairobi P. O. Box 30197, Nairobi, Kenya
*
E-mail: jmidiwo@africaonline.co.ke
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Abstract

Laboratory studies were conducted to assess the toxicity and growth-inhibitory activity against Aedes aegypti larvae, of the crude acetone extracts of Polygonum senegalense (Meissn.) leaves, its flavonoid component 2',6'-dihydroxy-4'-methoxydihydrochalcone and the internal tissue flavanol quercetin. The first two showed significantly high insecticidal and growth-inhibitory activity even at low concentrations, whereas quercetin was toxic only at concentrations above 7μg/ml.

Résumé

Des études au laboratoire ont été menées pour déceler l'effet toxique et inhibiteur de croissance chez les larves d' Aedes aegypti, par emploi des extraits bruts à l'acétone obtenus des feuilles de Polygonum senegalense (Meissn.) et en comparaison avec ses composants flavonoïdes: 2',6'-dihydroxy-4'-méthoxydihydrochalcone et du flavonol quercitine des tissus internes de la plante. Les deux premiers produits ont montré une activité hautement significative du pouvoir insecticide et d'effet inhibiteur de croissance même à des basses concentrations, au moment où la quercitine était seulement toxique à des concentrations supérieures à 7 μg/ml.

Keywords

Aedes aegyptiflavonoidsgrowth inhibitionmosquitoestoxicantsPolygonum senegalaiseAedes aegyptiflavonoïdesinhibition de croissancemoustiquesproduits toxiquesPolygonum senegalense
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 3 , September 1998 , pp. 229 - 234
Copyright
Copyright © ICIPE 1998

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