Mangroves are salt tolerant plants able to grow in extremely saline habitats and tolerate salinity by various eco-physiological mechanisms. The fresh leaves of Rhizophora mucronata were collected from Krusadai Island, Mandapam, Rameswaram. Mosquitoes are one of the most dangerous vectors among the group of arthropods. Infections due to mosquitoes are a major worldwide health problem, with high endemicity in developing countries. In the present study, we determined the larvicidal activity of acetone, diethyl ether, ethanol and methanol extracts of a mangrove plant Rhizophora mucronata against (4th instar larvae) Aedes aegypti. Mosquito larvicidal assays were conducted and their mortality rate was identified after 24 hours to evaluate the larvicidal activity of the crude extract of Rhizophora mucronata. All the extracts showed moderate toxic effect on larvae after 24 h of exposure; however, the highest mortality was found in methanol and ethanol extract against the larvae of Aedes aegypti (LC50= 10.73 and LC90= 31.44).
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