Sunscald occurs on green tomato fruit exposed to the sun. The initial symptom is a whitish, shiny area that appears blistered. The killed, bleached tissues gradually collapse, forming a slightly sunken area that may become pale yellowish and wrinkled as the fruit ripens.
The killed tissue is quickly invaded by secondary organisms and the fruit decays. Fruits most subject to sunscald are those that have been exposed suddenly to the sun because of pruning, natural spreading of the plant caused by a heavy fruit load, or loss of foliage from diseases.
The extent of the injury is more serious during periods of abnormally high temperatures. To prevent sunscald on tomato fruit, control foliar diseases and avoid heavy pruning or shoot removal.
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