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Some studies on pathogenicity of Coelomomyces stegomyiae against mosquito larvae in the laboratory

Published online by Cambridge University Press:  19 September 2011

E. S. Nnakumusana
E. S. Nnakumusana
Affiliation:
Department of Entomology, Uganda Virus Research Institute, P.O. Box 49, Entebbe, Uganda
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Abstract

Studies were conducted with Ugandan isolate of Coelomomyces stegomyiae against mosquito larvae. Aedes aegypti first instar larvae was most susceptible (99.8%) within 6 days, and the fourth instar was least susceptible (44.4%). Culex quinquefasciatus suffered 70% mortality within 10 days. Mortality rates were 92.5% for Culex tigripes, 70% for Culex duttoni, 89.5% for Aedes africanus, 89.9% for Anopheles gambiase and 97.3% for Aedes simpsoni. There was no infection when two species of the predatory mosquito Toxorhynchites were exposed to infection. A few adults emerging from an infected larval population were found infected when dissected. Other mosquitoes that pupated died and the pupae were found infected. Infected females were produced by 19.2% of the fresh pupae exposed. The importance of the results in biological control is discussed.

Résumé

Des études ont été faites sur le Coelomomyces stegomyiae isolé de l'Uganda. Celui-ci a été utilisé contre les larves de moustique. Les larves d'Aedes aegypti au premier stade étaient les plus susceptibles (99,8%) dans 6 jours et les larves ayant atteint le 4ème stade étaient les moins susceptibles (44,4%). Culex quinquefasciatus a subi une mortalité de 70% dans 10 jours. Le taux de mortalité de Culex tigripes était de 92,5%, le taux de mortalité de Culex duttoni était de 70%, celui de Aedes africanus 89,5%. Le taux de mortalité d'Anopheles gambiae était de 89,9%. Celui de Aedes simpsoni était de 97,3%. Il n'y a pas eu d'infection lorsque deux espèces de moustique prédatrice Toxorhynchites étaient exposées. Quelques adultes qui avaient émergé d'une population larvaire infectée ont montré des signes d'infection lors de la dissection. D'autres moustiques au stade de nymphe sont mortes et on a trouvé que les nymphes étaient infectés. 19,2% Des nouveaux nymphes exposés ont produit des femelles infectées. L'importance des résultats des le contrôle biologique est discutée.

Keywords

Coelomomyces stegomyiaeAnopheles gambiaeCulex quinquefasciatusCulex tigripesAedes aegyptiAedes africanusCulex duttonibiological controlAedes simpsoniCoelomomyces stegomyaieAnopheles gambiaeCulex quinquefasciatusCulex trigripesAedes aegyptiAedes africanusCulex duttonicontrôle biologiqueAedes simpsoni
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 1 , February 1986 , pp. 93 - 97
Copyright
Copyright © ICIPE 1986

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