A newly developed ULV formulation containing 25% bendiocarb suspended in a non-volatile oil and applied through a micro-gen aerosol generator ED2-20A at 74 ml (2.5 fl oz)/min and at 16 km/h (10 mph) successfully controlled caged mosquitoes in a series of field tests at Lake Charles, La., during late October, early November 1979. Cages were placed at 40 cm (16') and 160cm (64') above ground at 50 m (165') and 100 m (330') from the spray route. The species of mosquitoes controlled include Aedes aegypti, Ae. sollicitans, Ae. taeniorhynchus, Culex pipiens and Anopheles albimanus. Safety assessments were made by taking air samples at points 5-100 m downwind from the sprayer while spraying at 98 ml (3.3 fl oz)/min from which it is concluded that there is no significant hazard to human health, the concentration in air being well below established threshold limit values.