Abstract

Abstract. Culex quinquetasciatus mosquito is increasing problem of public health, being the vector responsible for West Nile Virus and Filariasis. Clorpirifos (Organofosfat) and Metonil (Carbamat) were known to posses insecticide activity against insect. The study was aimed to examine effectiveness of Klorpirifos and Metonil as larvicide against C quinque­fasciatus larval. Klorpirifos a signijicantly higher larvicidal activity against 3th_4th instar larvae ofC quinquetasciatus than Metonil. The larval mortality was observed after 24 h ex­posure. The LC95 value of Klorpirifos and Metonil were 3,139 mg/lt and 9,045 mg/lt, against C quinquefasciatus. The mixed ofboth insecticide was LC95 value 2,823 mg/lt. The result of this study suggested that Klorpirifos more effective larvicide against C quinquefasciatus than Metonil. Key Words : C quinquefasciatus.Insecticide, Klorpirifos, Metonil.