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Objective: To evaluate the efficacy of a synergized pyrethroid formulation containing 0.8% w/\udw s-bioallethrin, 18.7% w/w permethrin and 16.8% w/w piperonyl butoxide.\udMethods: Cold fogging was carried out against Aedes aegypti (Ae. aegypti) and Culex\udquinquefasciatus using a synergized pyrethroid formulation containing 0.8% w/w s-bioallethrin,\ud18.7% w/w permethrin and 16.8% w/w piperonyl butoxide. Three cages each containing 15\udmosquitoes and paper cups each containing 25 larvae in 250 mL of water were deployed at\udeach test pole between 10 and 40 feet. The formulation was diluted as 1:33, 1:50 and 1:100,\udrespectively, and applied using a mist blower.\udResults: Using the dilution ratio of 1:33 and 1:50, 100% adult knock-down was recorded after\udan hour of post spraying at all checkpoints for both species. The percentage of adult mortalities\udfor both species at 24 h post spraying ranged from 80% to 100%. Moreover, complete\udmortalities of Ae. aegypti larvae were demonstrated for both dilution ratio of 1:33 and 1:50\udat all checkpoints. Meanwhile, complete mortalities of Culex quinquefasciatus larvae were\udrecorded only at 10 and 20 feet with dilution ratio of 1:33.\udConclusions: These results showed that cold fogging using synergized pyrethroid formulation\udtested was more effective against Ae. aegypti between 10 and 30 feet with dilution ratio of 1:33

Efficacy of cold fogging of a synergized pyrethroid formulation against Aedes aegypti and Culex quinquefasciatus under simulated field conditions