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Toxicity of two bacterial insecticides against the larvae of mosquito Culex pipiens and their action on the reproductive potential and morphometric characteristics of surviving females

Published online by Cambridge University Press:  19 September 2011

M. S. Saleh ,
N. L. Kelada  and
A. A. Al-Fazairy
M. S. Saleh
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
N. L. Kelada
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
A. A. Al-Fazairy
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
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Abstract

The larvicidal activity of two entomopathogenic bacteria Bacillus thuringiensis H-14 and B. sphaericus 1593 against mosquito larvae of Culex pipiens has been evaluated. According to LC50 values obtained, B. thuringiensis (4.6 x 105 spores/ml) proved to be highly pathogenic to fourth instar larvae than fi. sphaericus (4.2 x 106 spores/ml).

Larval treatment with LC50 levels of both pathogens affected the reproductive potential of surviving adults during two successive gonotrophic cycles. These treatments caused insignificant changes in some basic morphometric characteristics of mosquito females that developed from surviving larvae.

Résumé

L'activité larvicide des deux entomopathogènes Bacillus thuringiensis H-14 et B. sphaericus 1593 a été evaluée sur les larves de Culex pipiens. D'après les valeurs de LC50 obtenues, B. thuringiensis (4.6 x 105 spores/ml) est plus pathogène sur les larves du quatrieme stade que B. sphaericus (4.2 x 106 spores/ml).

Le traitement des larves par les deux pathogènes, à un dosage correspondant a la LC50 a áffecté la reproduction des adults survivants durant deux cycles gonotrophiques successifs. Ces traitements, ont causé des changements insignifiants sur la morphologie des adultes survivants.

Keywords

Bacillus thuringiensisB. sphaericusCulex pipiensmosquito larvaemosquito femalesreproductive potentialmorphometric characteristics
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 1 , February 1987 , pp. 107 - 110
Copyright
Copyright © ICIPE 1987

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References

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