Soybean sudden death syndrome (SDS) is one of the most damaging diseases of soybeans in Iowa and much of the Midwest. There are two phases of this disease – a root rot phase and a foliar symptom phase. SDS will be most problematic when weather conditions are conducive for disease development during both phases. The early cool, wet weather we have seen so far in 2013 helps increase the root rot phase of the disease. This can lead to development of severe SDS later in the growing season, as was seen in 2010 in Iowa.
Iowa State University
Mueller, Daren S. and Leandro, Leonor F. S., "Sudden Death Syndrome and Heavy Spring Rains: Another Bad Year?" (2013). Integrated Crop Management News. 98.