Mosquito ovicidal activity of aristolochiaindica linn. (aristolochiaceae) extracts against aedesaegypti (linn.), anopheles stephensi (liston) and culexquinquefasciatus (say) (diptera :culicidae)

Janakan R and Ramakrishnan N

Plants may be a source of alternative agents for control of mosquitoes because they are rich in bioactive chemicals, are active against a limited number of species including specific target insects, and are biodegradable. They are potentially suitable for use in integrated pest management programs. Therefore, the present study was aimed to investigatethe ovicidal efficacy of different extract of Ariitolochiaindica (Aristolochiaceae) against Aedesaegypti, Anopheles stephensiand Culexquinquefasciatus. Ovicidal activity if selected mosquitoes eggs/eggeraft were exposed to different concentrations ranging from 100 – 500ppm and were assayed in the laboratory condition by using the standard protocol. The oval mortality was observed after 24 h of treatment. Among five solvent extracts tested the maximum efficacy was observed in the methanol extract and followed by ethyl acetate, dichloromethane, diethyl ether and hexane. The extract of methanol exerted 100% mortality at 300, 400 and 500ppm selected mosquitoes. From the results it can be concluded the crude extract of A. indica was a potential for controlling vector mosquitoes.

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