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USDA's August report projected record U.S. corn and soybean yields, but southern rust and emerging drought are raising concerns about the crop. Analysts say the crop may be slipping in yield terms, though USDA could still raise its September estimates.
Severe southern rust cases can wipe out up to 45% of a field's yield potential.
If disease and drought cut yields below USDA's record projections, feed grain and meal supplies would tighten and support prices. A September USDA upgrade would instead weigh on the market.
agweb.comAug 29, 2025After 56 past bullish disease events, Corn moved a median -0.1% over 5 sessions (48% higher; middle half -1.5% to +1.6%), and +0.8% over 20.
After 12 past bullish disease events, Soybeans moved a median -0.5% over 5 sessions (42% higher; middle half -1.6% to +0.1%), 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.
Southern rust and emerging drought raised doubts about record USDA yields, adding supply-risk premium to corn.
