Blight Already

I always do as I understood that the spores only survived on living plants.
I had really bad blight in the first year in a garden that had been a field for ever previously, and the nearest garden growing toms or spuds was a few hundred metres away. All plants were home grown so the blight must have blown in from some distance!
Composting infected plants doesn't seem to have made it worse; I lay the blame firmly on the weather!!