Will Disease Affect Soybean Yield?

We are hearing reports of soybean disease in some areas.  Today's U of I Pest Bulletin calls attention to sudden death syndrome (SDS) and white mold.  We also have seen SDS in Fayette County.  In addition we have heard reports of SDS all over the state.  Oddly enough this week's weather and crop report still shows 78% of the soybean crop in the good to excellent range.  Is somebody missing something  here?  The heat this week is catching us up on growing degree days, but if the crop is disesed, that might not help.