Red Crown Rot Spread Across Midwestern United States
The soil-borne pathogen has been identified in nine states since first appearing in North Carolina in 1972.
Updated on Sept. 25, 2026 in Botany
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Red crown rot has established itself across the midwestern United States after being first identified in Illinois in 2018. The pathogen has now been documented in nine states including Iowa, Minnesota, and Ohio.
Why it matters
The disease creates significant agricultural risks because the pathogen can survive in soil for over seven years. Its ability to spread through soil movement makes early detection vital for protecting regional crop yields.
The pathogen persists in soil for more than seven years, with affected fields experiencing yield reductions between 60 and 70 percent. The disease is currently present in Alabama, Louisiana, Virginia, Delaware, Missouri, Iowa, Minnesota, Indiana, and Ohio.
The players
Ontario soybean growers
These agricultural producers are closely monitoring the spread of the pathogen to protect their future crop viability.
The details
The pathogen typically spreads locally by just a few inches annually, though human equipment operations and wind transport can move inoculated soil to new fields. Growers in unaffected regions, such as Ontario, are currently urged to begin scouting for signs of the rot.
Timeline
Red crown rot was first observed in North Carolina in 1972.
The pathogen was officially identified in Illinois in 2018.
As of September 2026, no documented cases exist in Ontario.
The Big Picture
The current spread across the Midwest reflects a long-term geographic expansion following the 1972 North Carolina discovery. This trend shifts the discipline from localized containment to a broader regional management strategy for soil-borne pathogens.
Farmers must implement strict equipment sanitation protocols to prevent the transfer of contaminated soil between fields. Future agricultural yields remain highly dependent on the success of early scouting efforts to catch the pathogen before it matures.
The takeaway
Proactive field scouting remains the most effective tool for growers to mitigate the impact of this long-lasting soil pathogen. Developing a consistent sanitation routine for machinery is essential to stopping the spread of infested soil into clean areas.
Further reading
Learn more about the latest research and monitoring techniques in Botany.
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