Corn growers prepared for a repeat of 2025's severe southern rust outbreak, but the disease stayed limited in 2026 despite warm, moist Midwest conditions. Extension pathologists instead observed tar spot pressure and late-season stalk, crown and ear rots.
Lower-than-feared disease losses point to stable corn yields, which eases supply concerns for feed buyers. Growers may also cut back on preventive fungicide spending in future seasons.
After 358 past bearish weather events, Corn moved a median -0.3% over 5 sessions (44% higher; middle half -2.2% to +1.3%), and -0.5% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.