Location: Southern Horticultural Research
Title: Laboratory evaluations of Lepidopteran-active soybean seed treatments on survivorship of fall armyworm (Lepidoptera:Noctuidae) larvae Authors
Submitted to: Florida Entomologist
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 1, 2013
Publication Date: September 1, 2013
Citation: Thrash, B., Adamczyk Jr, J.J., Lorenz, G., Scott, A.W., Armstrong, J.S., Pfannenstiel, R.S. 2013. Laboratory evaluations of Lepidopteran-active soybean seed treatments on survivorship of fall armyworm (Lepidoptera:Noctuidae) larvae. Florida Entomologist. 96(3)724-728. Interpretive Summary: Throughout the Western Hemisphere, certain caterpillars can be damaging pests of soybeans. Historically, the use of foliar applied insecticides has been used to control these pests. Recently, the use of pesticides, including fungicides and insecticides, has been developed to be used as seed treatments. Applying compounds to the outside of the seeds offers reduced amount of pesticides in the environment and the reduction in non-target drift commonly associated with ground and aerial applications. In this study, we examine two relatively new insecticides as seed treatments to control certain caterpillar pests of soybeans. We discovered that when applied to the outside of the seed, season-long control of these pests was achieved. These products could be useful in reducing the number of foliar application required for caterpillar pests of soybeans and thus increase yield.
Technical Abstract: Two anthranilic diamide insecticides, chlorantraniliprole and cyantraniliprole, were evaluated as soybean, Glycine max L., seed treatments for control of fall armyworm, Spodoptera frugiperda (J. E. Smith). Bioassays were conducted using 2nd instar larvae and plants from both field and greenhouse grown plants. Cyantraniliprole and chlorantraniliprole in field grown soybeans significantly lowered survival at the V7 growth stage (51 DAP). At the R6 growth stage (112 DAP) survivorship was significantly lower in both chlorantraniliprole and cyantraniliprole treated plants. In many situations, survivorship was significantly lower in chlorantraniliprole treated plots than cyantraniliprole plots. 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 to other seed treatments. These products could be useful in reducing the number of foliar applications required for lepidopteran pests.