A good way to help producers with fungicide programs in peanut is to use Peanut Rx. Peanut Rx was developed by researchers and Extension specialists at UGA, University of Florida, and Auburn University. This program takes factors such as variety, planting date, plant population, row pattern tillage and field history to help growers calculate their risk for peanut diseases. Once their risk is calculated then a fungicide program can be implemented. Below are Peanut Rx programs from DuPont, Nichino and Syngenta.
The risk index is available at the link below.