Tomato blight, a fungal infection called Phytophthora infestans, spreads by wind and water-splash. It also attacks potatoes and is triggered by warm, wet conditions, making outdoor tomatoes more susceptible than those in a greenhouse. The crop is quickly ruined and even if it's immediately picked you can't stop the tomatoes rotting.

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In this clip from Gardeners' World, Monty reveals the tell-tale symptoms of tomato blight, and how to deal with it. Find out how he salvaged the remaining crop and what you should do with blight-affected plants to limit any further spread of the disease:

Symptoms

Ripening tomatoes develop brown sunken spots, which spread to the leaves and stems.

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tomatoes

Organic

Remove blight-infected plants as soon as they are identified, to prevent spread to other plants.

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Chemical

Since most copper fungicides have gradually been withdrawn from sale, there are currently no chemical treatments available for use on blighted tomatoes.

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