Abstract
Summary
The azo dyes p-dimethylaminoazobtenzene (DAB), m'-methyl-p-dimethylaminoazobenzene (m'DAB) and aminoazobenzene (AAB) were fed to the roach Blattella germanica (L) 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. DAB was the most active, m'DAB was next, and AAB was least active of the compounds fed.
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