Effects of Certain Azo Dyes upon the Cockroach Blattella germanica

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Abstract
The azo dyes p-dimethylaminoazo-benzene (DAB), m[image]-methyl-p-dimethylaminoazobenzene (m[image]-DAB) and aminoazobenzene (AAB) were fed to the roach at varying levels in both crude and synthetic diets. A dietary level of 0.2% of the dyes had little or no effect upon growth rate, survival or reproduction of the insects. However, characteristic lesions at the proximal ends of the Malpighian tubules occurred in roaches fed the dyes. DAP was the most active, m[image]-DAB was next, and AAB least active.
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