Larvicidal, Ovicidal and Repellent Activities of Pemphis acidula Forst. (Lythraceae) Against Filarial and Dengue Vector Mosquitoes

Abstract

Abstract: Crude leaf extracts of Pemphis acidula were evaluated for larvicidal, ovicidal and repellent activities against Culex quinquefasciatus and Aedes aegypti. The larval mortality was observed after 24 h exposure. The LC values of methanol, benzene, acetone were 10.81, 41.07, 53.22ppm and 22.10, 43.99, 57.66ppm50 respectively. Hundred percent ovicidal activities were observed at 350 ppm and 450 ppm. Skin repellent test at 1.0, 2.5 and 5.0 mg/cm2 concentration of P.acidula gave 100 % protection up to 2.30, 4.00 and 6.45 hrs and 2.45, 4.30 and 7.0 hrs respectively. From the present study it was revealed that extracts from P. acidula can be effectively used in the control of Cx. quinquefasciatus and Ae. aegypti. Key words: Pemphis acidula different extract Culex quinquefasciatus Aedes aegypti INTRODUCTION control differ from country to country and may not be Mosquito spread various vector-borne diseases such The residual spraying of insecticides is the most common as malaria, filariasis, Japanese encephalitis and dengue method of vector control, but usefulness of insecticides fever, which are transmitted by the four genera of in the control of vector-borne diseases is limited. Majority mosquitoes namely Anopheles, Culex, Aedes and of the chemical pesticides are harmful to man and