The purpose of the Regional Sudden Death Syndrome (SDS) Test is to evaluate the best experimental SDS resistant soybean lines, maturity group I to IV, developed by public researchers in the U. S. and Canada. Methods for the Regional SDS Tests are the same as those used by the USDA Uniform Soybean Tests Northern Region.
Illinois Sudden Death Syndrome rating: Plots were scored in the field by Southern Illinois University. All disease scores were interpolated to the R6.2 growth stage.
DI = SDS Disease Incidence (% of plants with visible symptoms).
DS = SDS Disease Severity (1 = mild chlorosis, 5 = severe leaf scorch, 9=premature plant death).
DX = SDS Disease Index (DI*DS/9)