Aqua-Reslin EC (20% AI permethrin, 20% AI piperonyl butoxide), Permanone EC (10% AI permethrin), and Suspend SC (4.75% AI deltamethrin) was applied to potted wax myrtle plants to evaluate their residual effectiveness against Aedes albopictus and Culex quinquefasciatus in individually screened outdoor cages. Three cages (one for each treatment) were used and measured 7.3 m (wide) x 15.2 m (length) x 2.5 m (height). Two test arenas (1.2 m diameter) at least 12.1 m apart consisting of 9 plants each for treatment and the same number of untreated plants for control were placed in the same cage. The study incorporated a 3x3 latin square rotation of treatments between cages. A counterflow suction trap baited with carbon dioxide (4.6 kg pressurized cylinder, release rate 500ml/min) was used to collect mosquitoes in the middle of each arena. Approximately 4000 adults of each species were released into each cage four hours before traps were turned on (trap operated for 16 hr, 4 pm-8 am CST). Excised leaf bioassays (24 h) were also conducted on the day of releases to determine residual effectiveness of each treatment against both mosquito species. Preliminary data showed that deltamethrin was the most effective treatment compared with the other two pyrethoid formulations.