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Baseline Susceptibility of the Diamondback Moth (Lepidoptera: Plutellidae) to Chlorantraniliprole in China

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Diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), has evolved resistance to various kinds of insecticides in the field. Chlorantraniliprole, which is a new pesticide of the anthranilic diamide group, provides potent and broad-spectrum activity within the insect order Lepidoptera. This insecticide provides a new option for control of P. xylostella populations resistant to other chemicals. The susceptibility of 16 field populations and seven laboratory maintained strains of P. xylostella to chlorantraniliprole were determined through leaf dip bioassay. The susceptibility variation among 16 field populations was low (five-fold), with median lethal concentrations (LC50 values) varying from 0.221 to 1.104 mg/liter. However, wider ranges of variation in LC50 values (10-fold) were observed among seven laboratory strains. Low level tolerance (six- to 10-fold) was detected in two laboratory-selected strains and three field-collected populations when compared with the susceptible Roth strain. A discriminating concentration (15 mg/liter) was calibrated from pooled toxicological data of the 16 field populations, as an important first step in resistance management, for the routine monitoring of resistance in the future. When assessed at the established discriminating dose 15 mg/liter, seven laboratory strains and five field populations showed an average mortality of 99.75% (from 98 to100%). Synergism assays showed metabolic enzymes might be involved in chlorantraniliprole detoxification in the susceptible Roth strain, but not in the additional observed tolerance of strains selected for resistance with other insecticides.
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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.
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