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Larvicidal activity of Bacillus thuringiensis serotype H-14 against mosquito larvae

Published online by Cambridge University Press:  19 September 2011

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

The larvicidal activity of the pathogen Bacillus thuringiensis H-14 against mosquito larvae of Aedes aegypti (L.) and Culex pipiens L. has been evaluated.

The results showed that the susceptibility of culicine larvae to this pathogen was closely correlated with mosquito species tested and its larval instars. The toxicity curves indicated that the serotype H-14 had a higher pathogenicity against A. aegypti than C. pipiens. LC50 values showed that, for both mosquito species tested, the second instar larvae were more susceptible to the pathogen used than the fourth instar larvae.

Apart from lethal action, larval treatments with B. thuringiensis H-14 led to a decrease in the reproductive potential of female mosquitoes that emerged from these treatments.

Résumé

L'activité de larvicide de pathogen Bacillus thuringiensis H-14 sur les larves des moustiques Aedes aegypti (L.) et sur Culex pipiens L. a étè evaluée.

Les resultats ont montré que la sensibilité de culicine larves envers ce pathogen influait sur ces espècis des moustiques et mëme sur tous les ages des larves. Les courbes toxicitalles ont montré que le sérotype H-14 ont temoigné qu'il fut dl une pathogenique très élevié sue le A. aegypti que le C. pipiens.

Selon les valeurs de LC50 on troursa que les larves 2 éme stade était le plus sensibles au B. thuringiensis que les larves 4 éme stade.

Les resultats ont montré que le traitement de larve par le B. thuringiensis H-14 aboutit à un effet decroissant très visible sur la reproduction potentielle des femelle moustiques emergeés parce traitement.

Keywords

Bacillus thuringiensisAedes aegyptiCulex pipiensmosquito larvaemosquito femalessusceptibility levelsreproductive potential
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 5 , October 1985 , pp. 617 - 620
Copyright
Copyright © ICIPE 1985

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References

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