There are several leaf diseases that can infect corn in Kansas in any given year. They can all be controlled with some combination of hybrid selection, tillage management, crop rotation, planting dates, or foliar fungicides.
corn leaf diseases southern rust leaf blight Goss's wilt gray leaf spot common rust
This article provides an update on the status southern rust and common rust on corn in Kansas as of June 25, 2021. Also discussed is an unusual symptom showing up in select northeast Kansas field called lesion mimic.