The time is fast approaching when seed producers need to be looking for early symptoms of leaf diseases in seed corn. Eyespot (Aureobasidium zeae), common rust (Puccinia sorghi), gray leaf spot (Cercospora zeae-maydis), and northern leaf spot (Bipolaris zeicola, also known as Helminthosporium carbonum) are diseases that can cause losses in seed corn production and sometimes need to be controlled with a fungicide application. In addition, Northern leaf blight (Exserohilum turcicum) seems to be making a "comeback" in some areas.