Toxicity of Isomers of Fenvalerate and Fluvalinate Against Boll Weevil (Coleoptera: Curculionidae) and Tobacco Budworm (Lepidoptera: Noctuidae) in the Laboratory and Heliothis Species (Lepidoptera: Noctuidae) in Field Tests

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Topical applications of the fully resolved active isomer ((S)-o-cyano-3-phenoxybenzy I (R)- 2-[2-chloro-4-( trifluoromethyl)-anilnio ]-3-methyIbutonate), the 'h- resolved isomer ((R S )-o-cyano-3-phenoxybenzyl (R )-2-[2-chloro-4-(trifluoromethyl)-anilino]-3- methylbutonate), and the 3/4-resolved isomer (25% R 75% S)-o-cyano-3-phenoxybenzyl (R)- 2-[2-chloro-4-(trifluoromethyl)-anilinol-3-methylbutonate) of fluvalinate were equally toxic to larvae of a laboratory-reared, insecticide susceptible strain (LSS) of the tobacco budworm, HeLiothis virescens (F.). Applications of the fully resolved active isomer ((S)-o-cyano-3- phenoxybenzyl 4-chloro-(S)-(1-methylethyl) benzeneacetate) of fenvalerate were significantly and 6 times more toxic to the LSS than to the field-collected strain. The LD50 of the fully resolved active isomer of fen valerate to the boll weevil, Anthonomus grandis grandis Boheman, differed significantly and was 48 times more toxic than that obtained by the racemic fluvalinate. The fully resolved active isomer as well as the 1/2- and 3/4.-resolved isomers of fluvalinate were also equally toxic to the boll weevil. Field trials were done in Georgia, Louisiana, North Carolina, and Texas to compare the effectiveness of the fully resolved active isomer and the 1/2-resolved mixture of isomers of fenvalerate and the 1/2-resolved mixture of isomers of fluvalinate with that of the respective racemic mixtures of isomers against Heliothis spp. The active isomer or the 1/2-resolved mixture of isomers of these compounds or both gave control comparable with that obtained with the racemic mixtures at lower concentrations. The 1/2-resolved mixture of isomers of fenvalerate did not differ from that of racemic fenvalerate in controlling the boll weevil in Georgia.

Document Type: Research Article

Publication date: February 1, 1989

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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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