Isomers of (3-Phenoxyphenyl)methyl (±)-cis, trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate Against Boll Weevils and Tobacco Budworms1234

Abstract

A laboratory strain of the tobacco budworm, Heliothis Virescens (F.), was generally more susceptible to topical application of the cis-, and trans-geometrical isomers of (3-phenoxyphenyl) methyl of (2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate than field-collected strains. The cis-isomer was more active than the trans-isomer. Low levels of the trans-isomer mixed with the cis-isomer appeared antagonistic to the activity of the cis-isomer against the laboratory strain, but high levels (60 and 75%) appeared synergistic against the laboratory strain. The boll weevil, Anthonomus grandis Boheman, was equally sensitive to both isomers and to the various mixtures of the isomers tested. In field trials. FMC-33297 (60 trans:40 cis) applied at the rates of 0.1–0.2 lb/acre was effective against the boll weevil, tobacco budworm, bandedwing whitefly, Trialeurodes abutilonea (Haldeman), and cotton fleahopper, Pseudatomoscelis seriatus (Reuter), and also against the predator complex.