The newer economic poisons of use in disease control
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The newer economic poisons of use in disease control

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      Insecticides have been used for disease control for a good many years. As early as 1892, L.0. Howard suggested the use of oil to kill mosquitoes. By 1914 oiling for mosquito control was a recognized part of the malaria vector control program in Malaya . Insecticides of one form or another, particularly pyrethrum space sprays, have supplemented sanitation and screening for control of adult mosquitoes and house flies since early in this century. Paris green was used for the control of mosquito breeding in the early 1920’s . With the advent of DDT a new technique was added, in that it became possible to apply to a wall an insecticidal residue capable of killing mosquitoes and flies which rested on that wall weeks and even months after treatment. The idea of a residual insecticide was not entirely new since agriculture had used residual stomach poisons for many years. It is very likely that some of the residual stomach poisons, particularly sodium fluoride as used against cockroaches, actually may have acted, at least in part, as a residual contact insecticide as well. However, the general application of an insecticide designed to kill by contact weeks after application was a revolutionary phenomen.
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