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Sclerotinia stem rot, or white mold of soybean, is a disease most commonly reported in high-yield soybeans in the North Central Region of the United States. Overall disease incidence and severity vary from year to year and from field to field. In Ohio, growers have faced localized outbreaks of this disease every year since 2009. Infection and disease development are favored by wet conditions and cool temperatures (<70°F) prior to, during, and following the flowering stage.
Click to enlarge photo. Symptoms and signs of Sclerotinia stem rot on plants in a soybean field (A and B); Sclerotia produced inside stems (C) and inside pods (D); Representation of the effect of the disease on pod filling: a branch from an infected plant in the right and a healthy plant in the left (E).