Fusarium overwinters easily as chlamydospores. I think the real issue is how many days with high soil temps we get in the warm parts of the year. Fusarium can be in the soil and not cause disease as long as conditions aren't optimal for its growth during the warm seasons.
As things heat up, I think most northern areas will see many more recurring problems with diseases that were previously thought to be only southern problems.
Fus. is more common in areas with sandy soils, probably because these are also soils favored by RKNs, which help accelerate the disease.
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