Can somebody help me determine what is wrong with my potato crop. My entire crop of King Edwards has either, when cut in half, started going black in the middle or is starting to rot on the outside. Looking at it's foliage, nothing untoward appeared to be wrong, aside from where the slugs had dined, but upon digging the tubers up I started noticing problems. Can I blame slugs, the excessively wet weather or is some other factor responsible (don't let it be blight, i've still got my reds in the ground). Any assistance given will be gratefully recieved.