Groups of 12 potted southern wax myrtle plants were treated with the following pyrethroid formulations: tau fluvalinate (Mavrik), beta cyfluthrin (Tempo), and lambda cyhalothrin (Demand) using a hand-held pump sprayer. After 24 hr, plants were moved to 7.3 m (w) x 15.2 m (l) x 3.1 m (h) screened field cages and evaluated weekly for 12 wks against adults of Aedes albopictus and Culex quinquefasciatus. A total of 3 cages were used in this study. Each cage contained a group of treated and untreated plants for comparison purposes. Plants were arranged in a semicircle in opposite corners of each cage. Approximately 4,000 mosquitoes of each species were released into each cage three days a week. Counterflow (MMX) traps baited with carbon dioxide were used to determine the number of mosquitoes in the area behind plants in each semicircle. In addition, excised leaf bioassays were performed to determine knockdown/mortality and longevity of insecticide residues on leaves. Results of both evaluation methods will be presented.