Abstract
A bioassay method, a modification of the WHO test for assessing resistance in mosquitoes, was used in a study of the residual activity of an emulsifiable concentrate and a wettable powder of benzene hexachloride on cattle. In 3 experiments, conducted during June-October 1965 with both formulations, there was a sharp decrease of gamma isomer activity in the first 72 hours post treatment. On the 4th to the 8th days post treatment some residual activity could still be detected, becoming negligible afterward. No appreciable difference could be noted between the emulsifiable-concentrate and wettable-powder formulations in residual activity and actual insecticide deposits on the coat of the animals; the wettable-powder preparation proved to be somewhat more persistent. Individual variations within the experimental groups were sometimes considerable and deserve further study. This method may be used in the study of pesticides applied to livestock under both laboratory and field conditions.
Published Version
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