On 18/03/2010 18:56, Bob Hobden wrote:


"David in Normandy" wrote
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.


If you mean a black ring around the inside of the potato, that is Sprang.


I wouldn't say it was a ring, really more random dark patches (grey /
black) typically the size of a sugar cube. I noticed it again today
while cutting up some shop bought potatoes for chips. If it is some
sort of disease perhaps I shouldn't compost the peelings?

--
David in Normandy.
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