White mold, caused by the fungus Sclerotinia sclerotiorum, is amongst the most devastating and recalcitrant plant diseases worldwide and results in substantial annual losses to soybean production. In Ohio, localized white mold outbreaks in soybean have been reported yearly with high prevalence in the northeast part of the state. The proposed project is applied research that will advance our understanding of the biology of S. sclerotiorum, which will, in turn, improve our predictive models to develop new white mold management strategies for soybean fields in Ohio. First, we propose conducting a survey to collect S. sclerotiorum isolates from soybean fields and incidence of white mold in northeast Ohio. Second, we will investigate disease incidence, severity, and yield response to fungicides applied in fields with history of white mold. Soil sampling to quantify sclerotia and spore traps to measure ascospore dispersal will also be used to better understand the biology of this pathogen.