Clay SEIA - 9/15/2025 08:22
IAEFC - 9/14/2025 20:08 Flat land and one line going perpendicular...sure that isn't pattern tile lines and the main showing up?
And that would certainly be likely with the excessive July moisture much of central-northern Iowa had. I don't think the very very limited information from this one single pic that doesn't even show the entire field in question or its topography is a smoking gun pointing to poor fungicide application/performance.
Fungicide Spray patterns