Tomato blight is an infection caused by the fungus, Phytophthora infestans. Also affecting potatoes, blight is spread by wind and water-splash, and is particularly prevalent in warm, wet weather.
To prevent the frustration of losing your crop of tomatoes to tomato blight, it's worth taking some simple steps to avoid it. Plants grown outside are more susceptible to infection, so you could also try growing tomatoes in a greenhouse, or grow blight-resistant varieties – there are plenty out there to try.
Follow our five simple tips to avoid losing your crop to tomato blight.
Keep them dry
Keep tomatoes dry – use an umbrella of polythene or a plastic roof over tomatoes planted outdoors to keep the rain off them.
Provide good ventilation
Make sure there is good ventilation around the plants – keep the sides of any cover open and try to condensation building up. Thin out some branches of vigorous bush varieties and remove weeds to allow air to circulate better.
Plant early to try for a harvest before late blight hits. Do not plant near potato crops that are susceptible to blight.
Choose resistant varieties
Choose a good resistant variety, such as ‘Losetto’ or ‘Lizzano’.
Practice good hygiene
Destroy blighted foliage to reduce chances of infection. Don’t leave potato tubers in the ground at harvest as they could harbour blight. Blighted foliage can be composted away from the crop as spores need a living host to survive for more than a few weeks.