Abstract
A method for controlled direct oral administration of liquid poison baits to active house flies, Musca domestica nebulo (F.), ad libitum without any contact is described. The toxicity of Sumithion® ( O, O -dimethyl O -(4-nitro- m -tolyl) phosphorothioate), diazinon, parathion, and malathion, in the presence of food components, assessed by this method, has shown the potentiation of toxicity of these insecticides to house flies in the presence of sugar alone, milk, or carrot juice mixed with sugar as compared to these in distilled water. Potato juice mixed with sugar reduced the toxicity significantly. Therefore, it is inferred that the toxicity of a particular insecticide is modified profoundly by the substrate composition. Hence, there appears to be great need for investigations on modification of toxicities of the present-day pesticidal chemicals by substrate factors. The oral administration method used to assess the relative toxicity of these insecticides showed that Sumithion was more toxic to house flies than diazinon or parathion, while malathion was least toxic.
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