నైరూప్య

Ovicidal and Larvicidal Efficacy Of Crataeva Magna (lour.) Dc. (Family: Capparidaceae) Against The Anopheles Stephensi, Aedes Aegypti And Culex Quinquefasciatus

Thangapandi Veni*, Thambusamy Pushpanathan and Jeyaraj Mohanraj

Plant crude extracts might be an alternative source for synthetic pesticides against clinically important vector mosquitoes. In this investigation we determined the ovicidal and larvicdal efficacy of five different solvent crude extract of Crataeva magna (Lour.) DC against the malarial, dengue and filarial vector mosquitoes. Larvicidal efficacy of C. magna was evaluated according to WHO protocol. Ovicidal efficacy of An. stephensi, Ae. aegypti and Cx. quinquefasciatus eggs/egg rafts, slightly modified method of Su and Mulla was performed. Ovicidal bioassay conducted with five different extracts confirmed the higher efficacy of methanol extracts exerted the zero hatchability at 240 ppm with An. stephesi, 320 ppm with Ae. aegypti and 400 ppm with methanol and ethyl acetate extract of Cx. quinquefasciatus after 48 h of exposure. Likewise, the methanol leaf extract of C. magna was found to be the most effective larvicide with LC₅₀ values of 121.69, 132.09 and 147.27 ppm after 24 h of exposure. The bioactive potential of C. magna as new ovicidal and larvicidal against An. stephensi, Ae. aegypti and Cx. quinquefasciatus vector mosquitoes are being discovered.