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Significance

Sudden death syndrome (SDS) is one of the most important diseases of soybean in North and South America (Aoki et al., 2005; Wrather and Koenning, 2006; Wrather et al., 2003). SDS first occurred in South America in the early 1990s (Roy et al., 1997). In the U.S.A., SDS was first discovered in Arkansas in 1971. The disease has spread extensively since then and now causes most yield losses throughout the North Central Region. SDS is most severe when soybean is planted early into cool, wet soils, when heavy midsummer rains saturate the soil, and when SCN is present.

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