Bob Hobden wrote:
"Ophelia" wrote

What is spraing, please?

The symptoms are brown arcs (like the rings of a tree) within the
potato that only show when the tuber is cut. Sometimes the arc is
woody too. Not nice if you are looking forward to a baked potato only
to find spraing when you cut into it.
Causes by a virus, usually the Tobacco Rattle Virus, transmitted by
nenatodes in the soil.

Thank you, Bob! I had never heard of that. Good stuff to add to my potato
file.