Most crops face pest situations where more than one insect pest become economic pest and require mixture of insecticide application for management. Presently two pyrethroids and three new chemistry insecticides in mixtures at their lethal concentrations were tested against second instar larvae of Spodoptera litura, under laboratory conditions using leaf dip method. LC50 of deltamethrin, bifenthrin, emamectin benzoate, chlorfluazuron and flubendamide were 619 and 100, 74.2 and 65.8, 0.08 and 0.06, 73.4 and 52.5, and 0.37 and 0.31 ul/ml, respectively after 48 and 72 hour exposure. Pyrethroids were least effective due to their high LC50 values as compared to new chemistry insecticides. Emamectin and flubendamide were more toxic with less LC50 values than chlorfluazuron at observed time periods. Mixtures of deltamethrin with chlorfluazuron, emamectin-benzoate and flubendamide were antagonistic. However, bifenthrin showed potentiation with emamectin and flubendamide which revealed that some pyrethroids can result in potentiating mixtures with new chemistry insecticides for S. litura control under multiple pest problem scenarios.
Keywords: Spodoptera litura, Pyrethroids, New chemistries, Potentiation
