'Many modern tomato varieties have made growing outdoor tomatoes easier because of earlier ripening and improved disease resistance,' says Simon Crawford. (Image credit: Future / Annaick Guitteny) Grow blight resistant tomato varieties Ensure potatoes and tomatoes are not planted in the same soil for successive years. Clear as many old potatoes as possible from a plot, ' advises Simon Crawford. 'Proper composting of plant waste is of paramount importance and ‘plant dumps’ must be eliminated in garden and allotment situations to reduce infection. We've found that history will repeat itself,' says Tammy Sons 'Tomato blight spores can stay in the ground for for 3 to 4 years. Never plant tomatoes in soil or compost that has previously contained diseased plants. Plant tomatoes in a disease free location.Try to water the soil only and keep the leaves and plants dry. This is to avoid the plants sitting damp all night. This avoids leaves resting on damp soil, and also helps air circulation and speeds the ripening of tomatoes by providing them with maximum sun exposure. Remove lower leaves as the fruits develop.'Bush varieties grown in pots can be trimmed and partially supported with a bamboo cane to avoid a dense mass of foliage,' says Simon Crawford. Support bush tomato plants with a stake to keep their leaves off the soil, or tie up cordon tomatoes regularly with soft twine to improve air circulation. Likewise, pick a well ventilated spot for growing the tomatoes outside.
If growing tomato plants in a greenhouse or polytunnel, avoid these becoming too humid by keeping them well ventilated.
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So learn how to prune tomato plants properly. 'Environmental control must focus on reducing the likelihood of leaves remaining wet for an extended period, so trimming foliage and side-shoots to maximise air movement and ensure the evaporation of surface moisture is essential,' explains Simon Crawford. The following environmental controls can help to prevent the occurrence or spread of tomato blight: (Image credit: Getty Images) Environmental controls for tomato blight
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