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middleish iowa | Cold winter temperatures will likely reduce some, but not all, pathogens for Iowa’s 2026 corn crop. While extreme cold temperatures below 0 F can decrease survival rates for certain diseases and insects like rootworm eggs, many pathogens, including those causing tar spot, can survive.
Southern Rust: Arctic cold waves are highly effective at reducing the survival of this fungus.
Tar Spot: This disease is hardy and capable of surviving cold winter conditions to infect crops the following season.
Corn Rootworm: Although adapted to cold weeks of sustained temperatures between can significantly reduce egg hatch, according to studies cited by Iowa State University. | |
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Any chance you change fungicide timing applications next year?
