D3437: Efficacy of in-furrow and foliar applied insecticides on the corn leafhopper in Oklahoma commercial corn

The corn leafhopper, Dalbulus maidis (Hemiptera: Cicadellidae), is an invasive vector known to transmit multiple pathogens that cause corn stunt disease. Until recently this pathosystem was considered of secondary importance in corn-producing regions in the Americas but has re-emerged as a major threat. Yield losses of 10-55% due to corn stunt disease were recorded in Oklahoma and Missouri commercial and sweet corn in 2024. Insecticide efficacy trials were conducted during the 2025 commercial corn growing season in Oklahoma. Data presented will include efficacy of the insecticide treatments as well as a net return analysis regarding the treatment cost. Equipping growers with a variety of chemical control options, providing them with an economic analysis of these options, as well as educating them on proper scouting, insecticide selection and application methods is crucial for protecting corn yields in future corn leafhopper outbreak years.