Except for one instance, that's the type of " rot' I'm having this year, as well. So far, removing all the soft area, and giving it a spray of listerene seems to be doing the trick. I've been "treating" with the plant still in the ground, but it sounds like yours is maybe bad enough to warrant digging, and a careful "examination". Good luck! If it's a "named cultivar", tell us the name, and maybe one of us has it?!.....Arlyn