Damon Smith, Extension Field Crops Pathologist, Department of Plant Pathology, University of Wisconsin-Madison
Here are two videos about soybean diseases. The videos were recorded a few years ago but are still relevant.
Brown Stem Rot In Soybean: https://www.youtube.com/watch?v=-KWu9dPCDXY
Sudden Death Syndrome of Soybean: https://www.youtube.com/watch?v=DaDfQplrFxw