"David in Normandy" wrote in message
. fr...
On 22/03/2010 20:19, Mike Lyle wrote:
someone wrote:
"David in 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.

It doesn't look like those when I see it. My money's still probably on
bruising: see at
http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=33


That looks like it! Bruising. Hmmm. Looks like someone hasn't been very
careful harvesting the potatoes. I've only seen this on shop bought
potatoes, never on my own.

Agreed!! I've just received vouchers for 2 more packs of the potatoes I
complained about. It will be interesting to see if they turn out to have
the same defect.
Graham