Abstract
Binary mixtures of permethrin with methyl parathion, chlorpyrifos, and malathion, respectively, in ratios of 9:1, 4:1, 2.3:1, and 1.5:1 insecticide: permethrin were tested for synergistic activity against larvae of Ostrinia nubilalis (Hubner). Statistically significant ( P = 0.05) synergistic activity was exhibited by all tested mixtures of methyl parathion + permethrin and chlorpyrifos + permethrin. On the basis of LD50 values, mixtures of methyl parathion + permethrin were ca. 14- to 89-fold more toxic to the larvae than methyl parathion and ca. 5- to 34-fold more toxic than permethrin. Mixtures of chlorpyrifos + permethrin were ca. 25- to 29-fold more toxic than chlorpyrifos and ca. 5-fold more toxic than permethrin. Synergism was not exhibited by the mixtures of malathion + permethrin.
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