Sudden Death Syndrome of Soybean:Fusarium solanias Incitant and Relation ofHeterodera glycinesto Disease Severity

Two morphologically distinct forms of Fusarium solani, designated FS-A and FS-B,were isolated from soybean plants with symptoms of sudden death syndrome, a disease of unproven etiology. Form FS-A was isolated seven to 17 times more frequently from symptomatic than from asymptomatic plants, whereas FS-B was equally frequent on symptomatic and asymptomatic plants. (...)