- DO NOT dig the potatoes up immediately. Oops. The reason for this is that the fungus spores will fall off the infected leaves straight onto the tubers, given half a chance.
- Instead, cut the tops (haulms) off and remove them, preferably burning them. If you're being really fussy, cover the ground at this stage to stop any spores from washing into the soil when it rains. Leave spuds in the ground for a couple of weeks and then dig them up.
- A minor infection on a tuber is no big deal. It may show as a brown patch on the skin, which can be cut off easily and the rest of the spud is fine.
- If caught early, blight is essentially a storage issue. Blight spores on the tubers will make themselves at home, more quickly if the skin is damaged, and gradually ruin the crop. If the spuds can be used quickly enough, it really isn't a problem.
Blight on potatoes, slightly more serious on the right hand one, but both possible to cut out and use the rest of the potato.