DuPont's Aproach.  People here saw 5-10 bushel advantage this year and I've heard the same in years past where white mold was a issue.  Timing, timing, timing.  If you miss 100% bloom your not going to get the results.  That could be a 3 day window. Everything that drives yield, creates vegetation, which creates low air flow.   "Here" row width less than 20" is a disaster waiting to happen.  Usually no-till keeps the plants shorter here and thus increases air movement.  Plant early.  Here going from may 5th to june 1 could be 10 bushel/acre.  If you like P the 22T69's held up great this year.