An area DSM was out scouting fields a few weeks back and found some significant problems with Aphanomyces Race 2.  He was in the Dubuque, Iowa area, which is known to be a hot-bed for APH2.  There were several areas in the field that were not as tall or vigorous.  He realized right away that it was likely an issue with APH2, so he dug up plants to see what was going on beneath the plant (APH2 is a soilborne fungus).