Soybean white mold (WM) disease caused by the fungus Sclerotinia Sclerotiorum has increased in severity in the upper Midwestern states in recent years. The disease can be very severe in soybean fields, especially during cool, wet summers. Soybean producers who have adopted management practices to maximize yield are often affected more by this disease. The growth and pathogenic activity of the white mold fungus is governed by the environment in the crop canopy, and is favored by dense canopies created by planting in narrow row widths, high seeding densities, early planting, high soil fertility and other factors that promote good plant health.
A long-term solution to white mold is the development of resistant soybean varieties. In the interim, white mold must be managed by careful variety selection and modifying crop management practices. One such management practice is the use of foliar applied fungicides and herbicides. This paper reports the results of field research studies conducted in Wisconsin from 1995 to 1999 designed to determine the effectiveness of using foliar applied chemicals to control white mold in soybean.