Tomatoes will develop brown patches, can shrink and rot (even after picking). There are more varieties that you can try, so do your research before planting. The fungus will also affect potato tubers and tomato fruit. Tammy Sons recommends some further blight resistant tomato varieties: 'Tommy Toes are heirloom red tiny tomatoes, robust in flavor and very juicy Legend variety is a red beefsteak and a favorite of most commercial growers Juliet is a small hybrid red tomato and Manyel is a yellow tomato also low in acid.' 'This blight resistant beefsteak tomato is sweeter than other beefsteak varieties.' 'With super blight resistance, this variety is ideal for growing outdoors.' This plant is high yielding, producing a mass of brightly, rich orange tomatoes.' 'This is the world’s first blight resistant orange fruited variety. Simon Crawford lists the following varieties: There are a number of varieties that have been bred with blight resistance. '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. infected late blight disease on tomato grown under field conditions, (El. Plant tomatoes in a disease free location. more effective in controlling late blight followed by Cure-plus, Galben copper.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. Tomato blight refers to a family of diseases caused by fungus-like organisms that spread through potato and tomato foliage, particularly during warm. 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. Late blight is more common in north central and northeastern states, but is observed in the Midwest when the humidity is high. As the common name implies, Phytophthora is prevalent on tomato hosts in late summer, after the plants have bloomed. Likewise, pick a well ventilated spot for growing the tomatoes outside. A strain of the fungus, Phytophthora infestans, causes late blight in tomatoes. If growing tomato plants in a greenhouse or polytunnel, avoid these becoming too humid by keeping them well ventilated. 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: Water the soil and feed plants regularly to keep them growing well – healthy plants can better resist pests and diseases.(Image credit: Getty Images) Environmental controls for tomato blight Look for disease-free seeds and only save seed from disease-free plants. If you don’t have enough space for this, consider growing tomatoes in pots and potatoes in grow bags. Choose a different spot each year (avoid planting in the same part of the garden for at least four years). Vegetable growers in western North Carolina: Be on the lookout (BOLO) for late blight on tomato and cucurbit downy mildew. Practice crop rotation and ensure potatoes and tomatoes plantings never follow. Remove diseased plants and bin or burn them. Fungal pathogens can persist on old material in the soil or on other ‘host’ plants, like nearby weeds, for up to a year. Remove dead or damaged leaves and make sure there’s good air movement around the plant. Destroy plants after harvest as the disease can spread to seeds.Įarly blight often occurs during humid weather and is most likely to attack plants under stress. The disease can be difficult to treat once established, but as soon as symptoms are noticed, apply a protective fungicide to prevent it from spreading.
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