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The pathogenicity of Bacillus thuringiensis isolated from the casuarina stem borer, Stromatium fulvum Vill. (Coleoptera: Cerambycidae) for larvae of two species of mosquitoes

Published online by Cambridge University Press:  19 September 2011

Ahlam A. Alfazairy
Ahlam A. Alfazairy
Affiliation:
Entomology Division, Department of Plant Protection, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
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Abstract

Bacillus thuringiensis H-14 (Alex), originally isolated from moribund and dead larvae of the casuarina stem borer, Stromatium fulvum, was tested in the laboratory against the second and fourth-instar larvae of both mosquito species, Aedes aegypti and Culex pipiens. The pathogenicity of this bacillus was established when both insects were found to be susceptible to infection over the whole range of test concentrations (0.005–0.35 mg/1). However, A. aegypti showed a higher degree of susceptibility to B. thuringiensis H-14 (Alex) than C. pipiens. A mortality of 100% was achieved within 24 hr with concentrations of 0.09 and 0.25 mg/1 for second- and fourth-instar larvae of A. aegypti, respectively. Also, younger larvae of both test mosquito strains were more susceptible than mature ones.

Résumé

Bacillus thuringiensis H-14 (Alex), original isoleé de larvés morte et de tige de casuarina stem borer, Stromatium fulvum, on a fait une expérience en laboratoire contre les larvés de II et IV stade à deux diffèrents èspeces de moustiques qui sont Aedes aegypti et Culex pipiens. On à prouvé que la stabilité du bacillus contre les maladies que chaque espèces de moustiques étaient sensibles contagé à la maladie dans toutes les concentrations (0.005–0.35 mg/1). On à prouvé que A. aegypti était plus sensible a B. thuringiensis H-14 (Alex) que C. pipiens on a obtenu 100% de taux de mortalité en 24 hr dans les concentrations 0.09 and 0.25 mg/1 a la II et IV stade larvés respectivement pour A. aegypti, mais 0.15 et 0.35 mg/1 et ce qui employé pour C. pipiens à la II et IV stade larvés respectivement. Aussi les petites larvés d'un âge plus petit était plus sensible que les larvés ageés.

Keywords

Bacillus thuringiensis H-14 (Alex)Stromatium fulvumAedes aegyptiCulex pipienssusceptibility tests
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 5 , October 1986 , pp. 633 - 636
Copyright
Copyright © ICIPE 1986

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References

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