Source: Ohio State University
There are no tried and true solid prediction systems, currently for white mold development on soybeans. However, conditions exist in Ohio similar to last year — with one key difference, it is hotter this year and moisture levels have been exceedingly higher in some parts of the state.
White mold infections are favored by consistently damp conditions (not flooded) from the time of canopy closure through flowering. These conditions favor the development of the fruiting structures, called apothecia, which form from those overwintering or survival structures called sclerotia. Sclerotia are the hard, black, irregular shaped fruiting bodies that form on and in the soybean plant. In many cases they look just like rat and mouse droppings but the difference is they are pink or white on the inside. Once these very small sclerotia germinate, the spores are deposited on the dying blossoms and from there they can infect the plants.