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Larvicidal Activity of Bacillus Thuringiensis Serotype H-14 Against Mosquito Larvae

  • M. S. Saleh
Article

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.

Key Words

Bacillus thuringiensis Aedes aegypti Culex pipiens mosquito larvae mosquito females susceptibility levels reproductive potential 

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 même sur tous les ages des larves. Les courbes toxicitalles ont montré que le serotype H-14 ont témoigné 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 résultats 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 émergées parce traitement.

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Copyright information

© ICIPE 1985

Authors and Affiliations

  • M. S. Saleh
    • 1
  1. 1.Entomology Division, Plant Protection Department, Faculty of AgricultureUniversity of AlexandriaAlexandriaEgypt

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