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 (Hübner). 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.
Document Type: Research Article
Publication date: February 1, 1982
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.