Southern Rust & Tar Spot

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There has been much discussion about the potential impact of Southern Rust or Tar Spot on corn yield this year. In this video I found both leaf diseases in a central IA field.
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I don't think I caught it, was any fungicide applied post tassel? Or would onset late enough that a treatment wouldn't have helped? I have some corn planted in that time frame and sprayed it all. So far it looks ok but I am seeing some rust now.

daveswensen
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I think when you see tarspot the corn is already more damaged than it appears

williamhamstra