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Larvicidal EfficacyOfExtracellularMetabolitesOfActinomycetes AgainstDengueVectorMosquito Aedes aegypti Linn. (Diptera:Culicidae)

M.Govindarajan, A.Jebanesan , D.Reetha

In this study 64 isolates of actinomycetes were isolated from different soil samples. Larvicidal activity of extracellular secondary metabolites of the actinomycetes isolates, were tested against Aedes aegypti. Among them 23 isolates showed positive larvicidal activity against Ae.aegypti. On further screening of the 23 isolates, four isolates of Streptomyces(A14, A21, A49, A63) and each one isolate of Micromonospora(A32) and Actinoplanes(A52) were found to be more active against the larvae of Ae.aegypti. The LC50 values of the metabolites ranged from 15.83 to 68.06l/ml. Among the six isolates, an isolate of Streptomyces(A21) exerted a very low LC50 value of 15.83l/ml.