ULV chemical control of mosquitoes, Culicoides and Tabanids in coastal North Carolina

Non-thermal aerosols of two insecticides, 95% malathion and a mixture of 5% pyrethrins with 15% piperonyl butoxide, were applied from a generator mounted on a truck moving at 10 miles/h in tests against several species of insects on the coast of North Carolina. Mortalities were recorded 3 h after application in tests against caged Tabanids situated 100 ft from the line of travel. Synergised pyrethrins dispersed at the rates shown in brackets caused mortalities of 78% against Tabanus nigrovittatus Macq. (3.5 US fl oz/min), 28% against Chrysops fuliginosus Wied. (4.0) and 52, 32 and 61% against C. atlanticus Pechuman (3.5, 4.0 and 7.0). The corresponding results for malathion were 28% (4.3), 54% (4.3) and 66, 91 and 99% (3.5, 4.3 and 7.0). As measured by light-trap collections made immediately before and one night after the applications, pyrethrins at 3.5 US fl oz/min caused 64% reduction in the numbers of Culicoides (mainly C. furens (Poey)) and 48% reduction in those of mosquitos (mainly Aedes taeniorhynchus (Wied.), A. sollicitans (Wlk.) and Anopheles bradleyi King); pyrethrins at 4.0 US fl oz/min caused reductions of 27 and 34%, respectively; malathion caused 0 and 43% at 3.0 US fl oz/min and 47 and 24% at 4.3.