The ascent of insecticides in the 1940s gave rise to using this method as a potential solution.  Some insecticides were found to be ineffective, such as DDT, but others were found to be “highly effective when sprayed over house walls at relatively high doses” (Dias et al., 604).  Due to this finding, many countries started to have spraying campaigns throughout the 1940s and 1950s (Vines, 2).  As insecticide technology developed to become more efficient and effective and less toxic, spraying campaigns have continued to be in use in multiple countries.