UJI LAPANGAN PERBANDINGAN DAYAGUNA CHLORPYRITOS DAN MALATHION SEBAGAI KABUT PANAS TERHADAP NYAMUK AEDES AEGYPTI DAN ANOPHELES ACONITUS DI YOGYAKARTA

Reduction of the dose of chlorpyrifos (Lorsban.480 EC) from 300 mllha to 100 mllha proved to be as effective as malathion at the dose of 438 ml/ha as shown in the previous field trial on Aedes aegypti and Anopheles aconitus mosquitoes in Yogyakarta. The present study aimed at examining the effectiveness of chlorpyrifos (Lorsban 480 EC) of lower dose (50 ml/ha) compared with malathion 438 m}/ha as thermal fog tested on the two species of mosquitoes colonized in the laboratory, and their impacts on the local population ofAedes aegypti. The test insecticide at dosages of 300, 200, 100, and 50 mllha, and malathion at the dose of 438 mllha were respectively applied as thermal fog to the two test mosquitoes and larvae in the residential areas of Yogyakarta Municipality. The four dosages of chlorpyrifos thermal fog seemed to be as highly adulticidal as malathion, and also relatively higher larvicidal than that of malathion. The impacts of the four dosages of chlorpyrifos thermal fog applications were apparent, and better than .that of malathion, on the local Aedes aegypti mosquito density parameters. Chlorpyrifos (Lorsban 480 EC) of 50 mllha was the recommended dosage whenever applied as thermal fog to control Aedes aegypti and Anopheles aconitus mosquitoes in Yogyakarta. Key Words : Chlorpyrifos, Malathion, Aedes aegypti, Anopheles acunitos, Therma