Abai, MR

6th International Congress of DipterologyLarvicidal and pupicidal effect of Datura metal L. var. onfilarial vector, Culex quinquefasciatus SayMurugan K. (1), T. Konishi (3), S. Kondo (2) & N. Uchiyama (3)(1) Department of Zoology, Bharathiar University, Coimbatore-641 046, India (E.mail:kmvvk@yahoo.com)(2) Department of Parasitology, School of Medicine, Aichi Medical University, Aichi480-1195, Japan(3) Department of Pharmacognosy, Faculty of Pharamaceutical Sciences, DoshishuWomen’s College of Liberal Arts, Kyotanabe-shi, Kyoto, 610-953, Japan.A study has been made to evaluate the larvicidal and pupicidal effect ofDatura metal (leaves, flower and seeds) against Culex quinquefasciatus.Plant extracts at different concentrations had considerable toxic effect on4 th instars and pupa of mosquito and it was dose dependant. Lethal (Lc50and Lc90) doses were worked out on the effect of plant extract againstmosquito larva and pupa. Evidence of larval and pupal mortality of filarialvector after the treatment of plant extracts may be due to the action of toxicalkaloids (hyoscyamine and Atropine etc.,). Growth regulatory activitywas noted at lower dose of plant extract treatment. Larval and pupaldurations were considerably extended after the treatment. The longevityand fecundity were also greatly affected by the treatment and suggestedthat plant extract greatly interfered the egg laying capacity of mosquito.Applications of plant extract in the breeding sites of filarial vector showedthat the higher percentage of larval reduction after 24 h, 48 h and 72 h.,predicts that the Datura metal extract can be used for environmentally safevector control programme at the sewage water system.Key Words: Culex quinquefasciatus, Datura metal, larva/pupal toxicity,growth, control∗∗∗∗∗∗∗∗∗∗172