Aerial application experiments with technical and diluted Dibrom 14 were conducted at Avon Park Air Force Range, Florida, using caged mosquitoes to bioassay effectiveness and downwind aerosol distribution. A total of 9 tests were conducted with caged Aedes taeniorhynchus females placed at 0.1 mi intervals for a distance of ca 2 mi in a line perpendicular to aircraft flight and parallel to wind direction. A dilute formulation of Dibrom 14 in heavy aromatic naphtha (HAN), 1:5 ratio, was applied at rates of 0.75 and 1.5 oz/acre (0.125 and 0.25 oz/acre Dibrom 14); and undiluted Dibrom 14 was applied at rates of 0.25 and 0.75 oz/acre based on a 2000 ft swath width and 150 mph aircraft airspeed. The results indicated that the dilute formulation applied at 1.5 oz/acre (0.25 oz/acre Dibrom 14) was more effective than 0.25 oz/acre Dibrom 14 undiluted and equal to 0.75 oz/acre Dibrom 14 undiluted. These results cannot be considered totally conclusive due to the variability of atmospheric conditions between tests and the lack of replication for some tests. However, the results strongly suggest that dilution substantially improved the application efficiency and that the rate of 1.5 oz/acre of the 1:5 Dibrom 14:HAN mixture gave excellent mosquito control under the environmental conditions existing during these test. Additional research will be needed to determine the applicability of this technique under other environmental conditions and to verity the effect on natural populations.