Posted: 16/09/2012 at 11:37
Having done some internet research, Italophile is spot on. This is Late Blight, the same that caused the Irish potato famine in the 19c. It thrives in the damp conditions that we have experienced this year. As suggested, prevention is better than cure (If indeed there is a cure) Italophile's measures have been endorsed by a number of sites. Hope no-one has suffered as badly as I have in losing the whole crop.