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Ovicidal activity of Solanum trilobatum L. (Solanaceae) leaf extract against Culex quinquefasciatus Say and Culex tritaeniorhynchus Giles (Diptera: Culicidae)

Published online by Cambridge University Press:  28 February 2007

S. Rajkumar
Affiliation:
Division of Vector Biology, Department of Zoology, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
A. Jebanesan*
Affiliation:
Division of Vector Biology, Department of Zoology, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
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Abstract

An acetone extract of Solanum trilobatum leaves was evaluated for its ovicidal activity on the mosquito species Culex quinquefasciatus and Culex tritaeniorhynchus, by exposing eggs ranging in age from 0 to 18 h to concentrations of 50–200 ppm of the extract, and assessing their percent hatchability. A 100-ppm dose of the extract killed all of the eggs from both species aged between 0 and 6 h. The 50- and 75-ppm concentrations were also highly effective against young eggs; the effect declined in older eggs. The extract was more ovicidal towards C. quinquefasciatus than C. tritaeniorhynchus. On a testé l'activité ovicide d'un extrait à l'acétone de feuilles de Solanum trilobatum sur les deux espèces de moustiques, Culex quinquefasciatus et Culex tritaeniorhynchus, en exposant des œufs âgés de 0 à 18h à des concentrations de l'extrait compris entre 50 et 200ppm et en évaluant le pourcentage d'éclosions. La concentration à 100ppm de l'extrait tue tous les œufs d'âge compris entre 0 et 6h des deux espèces de moustique. Les concentrations à 50 et 75ppm sont également très efficaces contre les jeunes œufs, mais l'effet diminue avec l'âge des œufs. L'extrait est plus efficace vis à vis de C. quinquefasciatus que de C. tritaeniorhynchus.

Type
Short Communication
Copyright
Copyright © ICIPE 2004

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