![]() infestans and key points of vulnerability in the host plant immune system must be understood. To achieve successful control over this pathogen, the molecular pathogenicity of P. The pathogen is cumbersome to control because of its fast-evolving nature, ability to overcome host resistance and inefficient natural resistance obtained from the available tomato germplasm. Late blight in tomato is caused by the oomycota hemibiotroph Phytophthora infestans, and this disease represents a global threat to tomato farming. If the disease is present in the area, follow a 5- 7 day fungicide schedule, using fungicides recommended specifically for late blight control.This review provides insights into the molecular interactions between Phytophthora infestans and tomato and highlights research gaps that need further attention.Preventative fungicide sprays for early blight, Septoria and anthracnose protect against late blight.Fruit symptoms are unlikely to be confused with other diseases, except buckeye rot however, late blight causes the fruit surface to become rough. ![]() Symptomatic leaves can be sealed in a plastic bag with a damp paper towel overnight, then checked for a gray to white moldy growth on the underside. Key diagnostic features on foliage are lesions that are not stopped at leaf veins. The organism can travel great distances by wind. The disease may overwinter in plant debris or cull piles (potato or tomato). The fungus grows most actively from 15- 21☌ (59- 70☏). Lesions on fruit appear as firm greyish-green to brown, rough, irregular shaped blotches, which rapidly enlarge.īuckeye rot (Fruit symptoms are unlikely to be confused with other diseases, except buckeye rot however, late blight causes the fruit surface to become rough.) ![]() Under favourable conditions, the pathogen can blight the foliage so quickly, that it appears the plants were hit by frost. These stem lesions may quickly girdle the stem and kill it. Brownish cankers may appear on leaf petioles and stems. On the underside of leaves, spots may develop a grey to white moldy growth, especially under conditions of high humidity. A pale yellow or green halo may surround the leaf lesions. Initial leaf symptoms are pale green to brown water-soaked spots, which enlarge rapidly and become brown to purplish-black. This disease is easily spread by wind and can rapidly destroy the crop. However, late blight causes the fruit surface to become rough. Fruit symptoms are unlikely to be confused with other diseases, except buckeye rot. Cool nights and warm days, with moist weather, are ideal for disease development. The late blight fungus prefers temperatures from 15- 21☌ (59- 70☏).
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