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Corn Belt agronomists described September as a rapid finishing month, with warm weather and high disease pressure pushing crops to maturity early. Tar spot and southern rust were widespread in Nebraska, and fungicide-treated acres performed better.
Disease-driven yield variation adds uncertainty to final corn output, which affects price expectations.
After 445 past neutral weather events, Corn moved a median +0.1% over 5 sessions (52% higher; middle half -1.4% to +1.6%), and +0.7% 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.