Absorption and Metabolism of Carbaryl by Several Insect Species1

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Abstract
The absorption and metabolism of C14 carbaryl was studied in the house fly, Musca domestica L.; stable fly, Stomoxys calcitrans (L.); boll weevil, Anthonomus grandis Boheman; and rice weevil, Sitophilus oryza (L.). Following topical applications of carbaryl, the percentage of the applied dose absorbed by each species of insect within 24 hours was: stable fly 56.7%, house fly 37.3%, boll weevil 12.2%, and rice weevil 3.3%. Five metabolites, including 1-naphthol, were isolated from insects by Florosil and thin-layer chromatography; 4 metabolites were unidentified. Carbaryl was quite stable in both species of weevils. The major metabolite in the feces of house flies was a highly polar material. There were no qualitative differences in number of metabolites isolated from house flies, boll weevils, and rice weevils, but there were quantitative differences in each metabolite present in the internal extract. The species specificity of carbaryl appeared to be functions of rate of absorption and enzymatic degradation within the particular insect species.