Efektivitas Metopren dan kelainan morfologi pada larva Culex quinquefasciatus

Abstract

Cx. quinquefasciatus is important ectoparasite that often interfere settlements. This species is the vector of several important diseases including Japanese Encephalitis and Filariasis. The aim of this study was to determine the efficacy of the larvacides methoprene to Cx. quiquefasciatus. The test conducted to Cx. quinquefasciatus 3rd instar larvae with gradual concentrations from 0.0108 g/L, 0.0217 g/L, 0.0325 g/L, 0.0433 g/L, and 0.0541 g/L. The result showed that the mortality of Cx. quinquefasciatus larvae/pupae after 120 hours of exposure were 66.8% at 0.0108 g/L concentration, 87.2% (0.0217 g/L), 90.4% (0.0325 g/L), 96% (0.0433 g/L), and 99.2% (0.0541 g/L). This suggests that the effective concentration of methoprene was ranging from 0.0217g/L–0.0541g/L. The observation on the same concentrations and exposure time of methoprene at 720 hours age residual solution was not effective to kill larvae/pupae because the mortality was less than 80% of all concentrations. The morphological abnormalities of the larvae and the pupae after methoprene exposure were (1) damaged of larvae bodies was 2%, (2) damaged of pupae abdomen (12%), (3) pupae with a rigid body (76%), and (4) failed eclotion of pupae (10%).