Western Bean Cutworm
Western bean cutworm is a pest of corn and dry beans, particularly in the southern Great Plains states, but can cause damage in other Midwest states. Moth counts are generally very low in Minnesota. Scouting for egg masses in corn occurs between 25 to 50% moth flight to determine if insecticide treatment is needed before larvae can enter the ear. Western bean cutworm degree-days for moth predicting moth flight are calculated simple degree-days with lower (38F) and upper thresholds (75F), and March 1st as the start date (Hanson et al. 2015. J. Econ. Entomol. 108: 1720-1727). Degree-days were calculated from daily temperature data provided by the U.S.A. National Phenology Network.