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For the past two years I have had blight on my tomato plants, both in the greenhouse and in the garden. The leaves just curl up and die. they go very crisp and there's no sign of mould. Can anyone suggest to me what I can do this year to stop this happening?

same here..think due to wet summers..if you don't want to use chemicals then don't grow them near where they were last year...

same soil=same blight..

for mor inf on blight google RHS. Org...home site of the royal horticultural society

There are chemicals which help the fight against blight. The are also semi blight resistant varieties of tomato. As wineo stated blight is more prevelent in warm wet conditions. In a nutshell if your area is prone to blight and you don't want to use chemicals then forget trying to grow tomatoes I'm afraid.