AbstractThe toxic effects of permethrin and ten of its degradation products on the growth of ten fungi were determined. Permethrin was relativelynon‐toxic, with an EC50of>100 mg litre−1but six of the degradation products were significantly (P= 0.05) more inhibitory. The ester hydrolysis products, 3‐phenoxybenzyl alcohol and 3‐(2,2‐dichlorovinyl)‐2,2‐dimethylcyclopropanecarboxylic acid, had EC50values ranging from 8 to>100 and 20 to>50 mg litre−1, respectively. Other degradation products that were more toxic than permethrin included 3‐phenoxybenzaldehyde and 3‐phenoxybenzoic acid, with EC50values as low as<1 mg lite−1. Hydroxylated and substituted‐benzene metabolites were non‐toxic. Combinations of selected test compounds yielded both synergistic, antagonistic and additive interaction responses, depending upon
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