D3480: Yield response of soybean to the soybean tentiform leafminer, Macrosaccus morrisella

Soybean tentiform leafminer, Macrosaccus morrisella (Fitch), is a tiny leaf-mining moth native to North America. Historically, M. morrisella has been known to feed on two native legumes, American hogpeanut, Amphicarpaea bracteata (L.) Fernald and sickleseed fuzzybean, Strophostyles leiosperma (Torr. & A. Gray) Piper. Beginning in 2016, reports began to surface in Quebec, Canada of M. morrisella feeding on soybean, Glycine max (L.) Merr. First reports of M. morrisella feeding on soybean in the US were made in Minnesota in 2021. M. morrisella larvae feed on internal leaf tissues leading to the loss of functional leaf area. Management recommendations for this new pest have not been investigated. In this study, two translaminar insecticides were evaluated for their efficacy in field applications against M. morrisella.