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The marine soil samples were collected from different locations of Parangipettai mangrove ecosystem, Vellar estuary, southeast coast of India. Totally 30 different marine actinobacteria were isolated by serial dilution plate technique on starch casein agar medium. The isolated actinobacteria were investigated for their larvicidal activity against Aedes aegypti and Anopheles stephensi mosquitoes. Streptomyces fungicidicus , S. griseus , S. albus , S. alboflavus and S. rochei were identified as potential biocide producers. Based on the antimicrobial activity, five strains were chosen for larvicidal and pupicidal activity. Among the crude extracts tested, the S. alboflavus extract showed significant activity against Ae. aegypti (LC 50 1.48 ± 0.09 and LC 90 3.33 ± 0.22) and An. stephensi (LC 50 1.30 ± 0.09 and LC 90 3.13 ± 0.21). Five isolates have shown a most significant mortality rate of the Ae. aegypti and An. stephensi mosquito larvae. This is an ideal eco-friendly approach for the control of Japanese encephalitis vectors, Ae. aegypti and malarial vector An. stephensi .

Larvicidal potency of marine actinobacteria isolated from mangrove environment against Aedes aegypti and Anopheles stephensi