Field Persistence of Six Insecticides for European Corn Borer Control123

Abstract

Six insecticides, formulated as sprays and granules, were field evaluated for 8 days to determine their potential efficacy for controlling 1st-generation Ostrinia nubilalis (Hübner), Toxaphene (1.0, 2.0 lb AI/acre), diazinon (1.0 lb AI/acre), carbaryl (2.0 lb AI/acre), EPN (0.5 lb AI/acre), carbofuran (1.0 lb AI/acre), and malathion (2.0 lb AI/acre) were applied to field corn that was subsequently artificially infested with black-heading corn borer egg masses at 2, 4, 6, and 8 days postinsecticide application. Data tended to demonstrate the advantage of granular insecticides over spray formulations for persistent reduction in borer cavities. Most granular insecticides were toxic to corn borers through out the 8-day evaluation period, while spray formulations tended to be less effective when compared to granule formulation after 5 days postapplication.