![]() ![]() Infection first occurs during periods of warm, rainy, humid weather. It is of particular importance in warm dry areas. Entire plant could be defoliated and killed Ⓒ Early blight ( Alternaria solani )symptoms on tomato leaf Ⓒ Clemson University - USDA Cooperative Extension Slide Series ( IntroductionĮarly blight is one of the most common and serious diseases of potato and tomato. Leaf spotting first appears on the oldest leaves and progresses upward on the plant. Affected leaves exhibit brown spots with concentric rings. Leaf spots of early blight are circular, up to 1.2 cm in diameter, brown, and often show a circular pattern, which distinguishes this disease from other leaf spots on tomato. Ⓒ Allen Stevens and Jon Watterson, Seminis Vegetable Seeds, Inc.Įarly blight on tomato. The spot is usually brown to black, firm, depressed and has distinct concentric rings. Typical fruit spots occur at the stem-end as a rot that radiates out from the area of attachment between the calyx and the fruit. Reproduced from University of Minnesota Extension.Įarly blight symptoms on tomato fruits. Internally, the tissue shows a brown to black corky, dry rot, usually not more than 6 mm. There is usually a well defined and sometimes slightly raised margin between healthy and diseased tissue. Lesions are usually slightly sunken, circular or irregular, and vary in size up to 2 cm in diameter. CAB International, Wallingford.Įarly blight symptoms on tomato fruit Ⓒ A.A.Seif, icipeĮarly blight results in surface lesions that appear a little darker than adjacent healthy skin. Reproduced from the Crop Protection Compendium, 2004 Edition. Varela, icipeĮarly blight symptoms on okra leaf Ⓒ M.
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