Posted: 13/08/2012 at 18:13
Leggi, the problem isn't your patch. Unless you have spuds infected with LB lying around the place! The spores travel on the breeze, they can come from anywhere, and revel in mild to warm, damp conditions. In a hot, dry summer you rarely see LB. In fact, you don't see many fungal problems in hot, dry conditions. I don't see many here.
All you can do is plant, do your utmost in terms of plant housekeeping, and cross your fingers. You can also spray preventively against many of the fungal problems, but the traditional fungicides - the copper based ones - are much less effective against LB.