Should you apply a fungicide to corn? Although it sounds cliché, it depends.
Fungicide applications curbed disease and protected yield potential when applied to a disease-susceptible hybrid in a 2025 trial conducted by Iowa State University and Wyffels Hybrids.
However, fungicide applications on a disease-resistant hybrid showed little or no yield response in the same trial. This occurred under extreme southern rust pressure — the worst since 1999 in Iowa…