AbstractLaboratory studies of the cotoxicity of a pyrethroid insecticide, fenvalerate, and several organophosphorus insecticides against the two‐spotted spider mite,Tetranychus urticaeKoch, showed that a useful degree of potientation of toxicity occurred. The most effective combination of fenvalerate and azinphos‐methyl was found to be a 1:1 ratio. Phosphates and phosphorodithioates in combination with fenvalerate were more toxic than phosphoromonothioates. The results suggest a practical method of improving the acaricidal activity of pyrethroid insectici
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