The same mould that causes potato blight affects tomatoes as well. Tomatoes and potatoes are quite closely related so it makes sense.
Just like potatoes, the first symptom is brown patches on the leaves which spread really quickly followed by the whole plant dying. This can happen in just a couple of days so if you spot blight on your tomato plants you need to act immediately.
Harvest all the fruits of a reasonable size, both green and ripe. Use the fruits up quickly as they may be infected. Leaving the green fruits to ripen is not a good idea as the chances are they’ll be rotting in a week with the blight.
So here are some suggestions from our recipes and food section to use up those ripe and green tomatoes quickly.