Ultralow Volume (ULV) Application of Insecticides *

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Abstract
Summary The ULV technique of applying insecticides has proven to be a very useful and economical method for controlling many species of insects. The degree of effectiveness of ULV sprays and aerosols against adult mosquitoes is correlated with the size of the insecticide droplets. The most effective size range of droplets for ground aerosols is about 5 to 10 µ mmd, and for aerial sprays, 10 to 25 µ mmd. Droplets larger than these sizes may be wasteful and ineffective because they contain more insecticide than is required to kill a single mosquito and they may impinge rapidly on vegetation. ULV applications from aircraft should be correlated with weather conditions so that insecticide does not drift out of the treatment area. Equipment for ground ULV applications is very good but aerial ULV equipment needs improvement. Preliminary tests with ULV for anopheline control indicate it may be a useful adjunct to currently used procedures; however, more information on effectiveness of various insecticides and timing and frequency of applications is needed.

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