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Effects of six insect growth regulators on mosquito larvae of Aedes aegypti

Published online by Cambridge University Press:  19 September 2011

M. S. Saleh
M. S. Saleh
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
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Abstract

The biological effects of six insect growth regulators (IGRs) AI3-37634-c, AI3-36877-b, AI3-37603-b, AI3-36807-b, AI3-37837-a and AI3-36809-a against immature stages and adults of Aedes aegypti have been evaluated. According to IC50 values obtained (concentration to inhibit the emergence of 50% of adults), AI3-36809-a (0.02μg/ml) proved to be the most effective compound, followed by AI3-37603-b (0.04μg/ml), AI3-37837-a (0.11μg/ml), AI3-36807-b (0.17 μg/ml), AI3-37634-C (0.48 μg/ml) and AI3-36877-b (1.4 μg/ml), respectively. The results showed also that the duration of the fourth instar larvae of A. aegypti was prolonged when these larvae were exposed to the effective concentrations of the above compounds.

Apart from delayed lethal action, possible effect of the compounds tested on the basal follicle numbers developed by females of A. aegypti which survived after larval treatment with IC50 of the above-mentioned compounds has been considered. Generally, the results indicate that the females treated have more follicles than the untreated ones of similar age and grown under identical conditions.

Résumé

Les effets biologiques de six régulateurs de croissance dans les insectes (IGRs) AI3-37634-C, AI3-36877-b, AI3-37603-b, AI3-36807-b, AI3-37837-a et AI3-36809-a sur les stades non mûrs et adultes de Aedes aegypti ont été évalués. D'après les valeurs de IC50 obtenues (concentration nécessaire pour inhiber l'émergence de 50% d'adultes), AI3-36809-a (0,02 g/ml), fut le composé le plus efficace, suivi par AI3-37603-b (0,04 g/ml), AI3-37837-a (0,11 g/ml), AI3-36807-b (0,17 g/ml), AI3-37634-C (0,48 g/ml) et AI3-36877-b (1,4 g/ml), respectivement. Ces résultats ont aussi montré que la durée de la 4éme phase des larves d' A. aegypti était prolongée quand ces larves étaient exposées aux concentrations efficaces de ces composés. Hormis l'action mortelle retardée, on a aussi considéré l'effet possible des composés testées sur les effectifs de base de follicules développées par les femelles de A. aegypti qui ont survécu après que leslarves avaient été traitées au IC50 des composés mentionnées plus haut. En général, les résultats montrent que les femelles traitées ont plus de follicules que celles qui ne le sont pas quand elles ont le même âge et quand elles sont cultivées dans les mêmes conditions.

Keywords

Growth regulatorsAedes aegyptibasal follicle numbersbiological effectsRégulateurs de croissanceAedes aegyptiquantités de base de folliculesaction mortelleeffets biologiques
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 5 , October 1985 , pp. 609 - 611
Copyright
Copyright © ICIPE 1985

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References

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