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.
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:
Ripening tomatoes develop brown sunken spots, which spread to the leaves and stems.
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Remove blight-infected plants as soon as they are identified, to prevent spread to other plants.
Since most copper fungicides have gradually been withdrawn from sale, there are currently no chemical treatments available for use on blighted tomatoes.