Blight on plants8/22/2023 Harvesting tomato fruits with visible disease lesions. Not plant these sites with these groups of vegetables for two to three years. Rotate tomatoes with vegetables unrelated botanically to tomatoes or potatoes. Infected plants can be rogued and either buried or burned. What should be done if tomatoes have been infected by late blight?Ĭontinue weekly spray applications to protect plants from further infection. Otherwise, apply protectant fungicides beginningĪt flowering for control of late blight and other tomato diseases. If conditions are favorable for late blight development, start a weekly spray application Target the fungus specifically, consult the 2009 Commercial Vegetable Production Read the label on any fungicide before application. FixedĬopper products (Kocide) can be used by organic gardeners to prevent late blight (e.g., Bravo, Echo, Equus, or Daconil) and Mancozeb (Manzate) can be used. Gardeners and commercial producers, protectant fungicides such as chlorothalonil Spraying fungicides is the most effective way to prevent late blight. Late blight destroying all tomatoes at once. Planting or planting several crops of tomatoes over time will reduce the risk of Tomatoes on sites that were previously in potatoes or close to potatoes. Staking or caging tomatoes will result in faster drying of the foliage.īefore planting, inspect transplants for any symptoms of disease. Mulching with plastic or an organic material will reduce the development of earlyīlight more than late blight, but these diseases often work in tandem to destroy Plants should be spaced relatively wide within the row to facilitateĪir movement, and plants should not be handled when the foliage is wet. Since late blight favors wet, cool weather for infection, cultural practices haveĪ relatively small effect on controlling this disease. How can late blight be prevented or managed? Lesions are usuallyĪre there tomato cultivars which are resistant to late blight?Ĭurrently there are no tomato cultivars with complete resistance to late blight. Large rough, brown lesions appearįigure 2. Infection of a tomato field can occur in a few days. Under favorable conditions, all parts of the plant can become infected. On the stem while the foliage appears burnt Move from the outside of the canopy inward (Figure 1).įigure 1. Infection on the lower leaves of the tomato plant, late blight infections seem to Unlike early blight, which typically begins The lesions eventually turn brown and the plant looks like it has beenįrost-damaged or blasted by a blowtorch. Late blight symptoms include leaf, stem, and fruit lesions that have a water-soakedĪppearance. What are the symptoms of late blight on tomatoes? Late blight is favored by cool, wet weather and will cycle repeatedly if weather Rain deposits spores onto plants, causing infection. Spores of this fungus can be airborneĪnd travel great distances in storms. Late blight is spread from infected transplants, volunteer potato or tomato plants,Īnd certain weeds botanically related to tomatoes. Late blight ( Phytophthora infestans) is one of the most serious fungal diseases that Lawn, Gardening & Pests Learning Activities.
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