This season’s stress pattern marks a clear shift from last year, trading excess moisture for heat and dryness during the crop’s most sensitive stages. The mid-July heat wave that settled over the Dakotas, Minnesota, and Nebraska struck right as corn was pollinating, raising concerns about kernel set even before disease pressure entered the picture. With tar spot and southern rust now appearing across the Midwest, growers are weighing fungicide decisions against an already stressed crop, adding real uncertainty about how this year’s yields will hold up at harvest.