Posted: 03/07/2013 at 20:05
After the leaves roll up do they go hard and brittle. Are the plants stunted, if so this would indicate leaf roll virus. Did you start off with seed potatoes or were they spuds from the supermarket?
Leaf roll virus is carried by aphids, the plants become stunted and they have a poor crop. There isn't any treatment, using virus free seed spuds will prevent the virus and spraying any aphids on the plants when they appear also prevents it.
The information I've found about Leaf roll virus wouldn't indicate it's spread by the wind but by aphids, so if that's the problem your other plants shouldn't be affected providing you keep them aphid free.
I'm no expert though, other posters may have a different view.