Growing Tomatoes - Watering and Disease

When watering, avoid splashing soil up onto the lowest leaves which may transfer soil infections into a plant through the leaves. Splashing water up onto growing fruit may also create ghost spot which is caused by grey mould soil spores and displays small transparent water-like rings.

It's also a good idea to pull off suckers, side shoots and leaf branches by hand rather than cut them because the blades of knives and scissors can spread disease from one plant to another.