Laboratory Evaluations of Lepidopteran-Active Soybean Seed Treatments on Survivorship of Fall Armyworm (Lepidoptera: Noctuidae) Larvae

Abstract

Two anthranilic diamide insecticides, chlorantraniliprole and cyantraniliprole, were evaluated as seed treatments on soybean, Glycine max L., for control of the fall armyworm, Spodoptera frugiperda (J. E. Smith). Bioassays were conducted using 2nd instars and plants grown from the field and greenhouse. In field-grown soybeans, cyantraniliprole and chlorantraniliprole significantly lowered survival of fall armyworm larvae at the V7 growth stage (51 DAP), and, at the R6 growth stage (112 DAP), and survivorship was significantly lower on plants treated with both chlorantraniliprole and cyantraniliprole. In 6 out of 9 total post treatment evaluations, survivorship was significantly lower in chlorantraniliprole seed treatments than in cyantraniliprole seed treatments. Greenhouse grown plants treated with cyantraniliprole and chlorantraniliprole significantly reduced survival at the V3 growth stage, 2, 3 and 4 days after infestation when compared with other seed treatments. These products could be useful in reducing the number of foliar applications required for lepidopteran pests.