Blight fright with a tomato source

How can I protect my tomato plants from

blight? Eddie, Chepstow, Monmouthshire DAVID: Blight is a fungal disease that affects tomato and potato plants. Warm, wet summers are the cause.

Don’t plant tomatoes where potatoes have grown and pick a sunny, well-ventilated spot. Water the soil not leaves, and remove lower leaves for air circulation. Feed with potassium and cut off and burn infected plant matter.