12/5/2023 0 Comments Blight tomatoesReducing periods of leaf wetness with appropriate irrigation strategies ensuring that foliage dries-off before nightfall.Avoiding planting downwind of another potato or tomato crop.Choosing well drained sites and those that allow adequate air movement.Planting cultivars with resistance to Late Blight.Severity of late blight on tomato varieties evaluated at LIHREC in 2013. Affected leaves may die prematurely, exposing the fruits to sunscald. Organic growers on Long Island who grew late blight-resistant varieties in 2013 were satisfied with the varieties and control achieved, and appreciated the insurance provided by plant resistance to such a destructive disease that can occur unpredictably. The surrounding leaf area may turn yellow. Symptoms: Dark spots with concentric rings develop on older leaves first that touch infected soil. In addition to fungicide applications, preventive measures can reduce the infection by Late Blight: Early blight is a fungal disease that can affect the foliage, stems, and fruit of tomatoes. Soft Rot follows Late Blight infection which leads to decay and disintegration of fruit. In moist weather a thin downy film may develop on the infected lesion. Petioles and stems become infected in a similar way so that eventually the whole plant may die.įruit lesions appear as dark, olive colored greasy spots which may enlarge until the entire fruit is infected. As the lesions develop, this downy growth may be seen only the perimeter of the lesion.īadly infected foliage will eventually turn brown, shrivel and die. Leaf lesions first appear as irregularly shaped, water-soaked spots which may enlarge rapidly into pale green to brown lesions that cover large areas of the leaf.ĭuring humid conditions the undersides of these lesions may develop a white downy growth. Late Blight can attack all parts of the tomato plant. Cool wet weather is essential for infection and disease development. In moist weather, spores produced on the white and downy affected areas, are spread by wind. The source of infection is caused by the fungus Phytophthora infestans.
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