"David in Normandy" wrote in message
. fr...
Any ideas what cause this? I'm just curious. It doesn't seem to be
directly related to slug damage as the black / grey mass can sometimes be
quite deep inside otherwise apparently pest free potatoes.


Could it be internal rust spot?

http://www.potato.org.uk/department/...f.html?item=42

If not that, then maybe blight or gangrene.

someone