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Southern rust, which caused heavy losses in 2025, did not spread widely in the 2026 US Corn Belt despite abundant moisture and favorable conditions. Growers instead faced a mix of foliar diseases and later stalk, crown and ear rots.
Extension pathologists advise against planning next year's fungicide use based only on this season.
Lower-than-feared disease pressure supports yields and the corn supply outlook, which weighs mildly on prices. Growers who over-applied fungicides may cut back, which affects input demand more than grain supply.
agweb.comNov 13, 2026After 145 past neutral disease events, Corn moved a median +0.4% over 5 sessions (58% higher; middle half -1.2% to +1.7%), and +0.0% 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.
