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Eastern Iowa corn yields swing widely amid weather and disease pressures

Many corn farmers are seeing large yield swings this harvest.

Dalton Webster, an agronomic service representative with Syngenta, says weather and disease pressure were major factors in eastern Iowa.

“Absolutely huge differences, sometimes from one farm to the next or even within a field. Just crazy big variabilities.”

He tells Brownfield growers who applied fungicide saw yield reductions of 15 to 30 bushels an acre compared to 2024.

“But if a grower chose not to apply a fungicide in 2025 with the disease pressure we had, could’ve been 50, 60, 70 bushels less than last year.”

Webster says corn yields range from 160 to nearly 300 bushels.