Organophosphate & pyrethroids resistance of aedes albopictus in Subang municipality / Khairul Ryzman Bahari

Introduction: Dengue Fever (DF) is transmitted through the bite of Aedes mosquito. Cases ofDF have increased globally and have become endemic especially in Asian region. In Selangor especially in Subang Jaya have increases day by day. This might due to the repeated use of chemical towards the mosquitoes. Objective: This study focused on the knockdown rates and mortality rates of mosquitoes being exposed to the commonly used insecticide in hotspot and non-hotspot areas at Subang Jaya Municipality. Method: Four administrative zones were selected as study locations which are Subang Jaya, Kinrara, Seri Kembangan and Seri Serdang and for each admin zone 3 hot spot and 3 non-hotspot areas were selected. Ovitraps were placed at each administrative zone that has been identified as dengue prone areas. The eggs were reared until it emerged into adults. Specific species, which is female Aedes albopictus were chosen to be exposed to the commonly insecticide, malathion, permethrin, deltamethrin and lambdacyluthrine using WHO Bioaassay Test Kit. Time taken for knockdown rates and mortality rates were recorded and analyzed using Probit analysis. All the results then were illustrated in the graph. Results: The knockdown rate of Aedes albopictus from HS areas was higher compared to the non­ hotspot area especially when they are exposedzo malathion while the mortality rate for most of non-hotspot areas indicates susceptibility to the mosquitoes. Conclusion: Repeated uses of chemical exposure towards mosquitoes affect the resistance status.