Sudden Death Syndrome (SDS) is a soil-borne disease that infects soybean roots and produces a toxin(s) that affects the foliage. Quantifying yield losses can be difficult and varies from year to year. Although SDS disease severity may be increased in plants co-infected with SCN, it can and does develop in absence of SCN. Management of SDS could be enhanced if we had a better understanding of such factors as: the type and aggressiveness of the infecting agent, a better understanding of its distribution by county, its association with SCN in Michigan, and a better educational program to relate findings to producers. This project provides a pro-active approach to addressing SDS in Michigan.