With the German cockroach absorption was slow and excretion rapid. 1- 
Naphthol was evident in the excreta at 24 hours and in tissues at 72 
hours. Six metabolites were demonstrated. In the housefly, three metabolites 
were demonstrated. Changes undergone by l-naphthol showed that it formed 
the same series of more polar products, indicating that hydrolysis of the 
ester bond was the first step in metabolism of sevin by these insects 
(Eldefrawi and Hoskins, 1961). 
When applied to plants, sevin was converted into unidentified water- 
soluble materials which were quite stable within the plants. 
1-Naphthol and phthalic acid have been identified by gas chroma- 
tography and thin-layer chromatography after ultraviolet exposure of 
sevin (Crosby, 1964; Okada et al., 1961). Several other compounds were 
observed also but not identified. 
ONS 
rod “CHs 
& 
Sevin 
UV 
OH 
fe) 
(> + H + Other 
Cmpds. 
O 
145 
