Soybean plants in the field showing symptoms of soybean sudden death (SDS) will be removed and FSSC isolates cultured from the hypocotyl tissue. Genetic material of the fungus will be extracted and the genetic background of the fungus determined using well established molecular methods that include DNA sequencing. Pathogenesis of representative isolates will be evaluated in a growth chamber on susceptible soybean cultivars. Additionally, fungicide efficacy will be evaluated for members of the FSSC isolates in Alabama to determine possible disease management recommendations.