Sunscald

Sunscald Common name Sunscald Southwest injury Causal agent Sunscald is a physiological disorder primarily seen in thin-barked trees. During winters, the northern wood trees are exposed to direct sunlight on their southwest side. This awakes the trees from their dormancy. When night falls, and the temperature drops significantly, the active bark cells die due to extreme temperatures.     Symptoms & Signs The scalded area of the bark shows discoloration, sinks inside, and may fall off, displaying dead tissues of the cambium. This opening gives way to many pathogens that can enter and cause further damage to the trees. Leaves also show signs of scalding by withering and dried leaves. Fruits, especially ripened, also develop wrinkled patches, which turn soft on the exposed side. The exposed area turns white and gives rise to the growth of fungal colonies. Time of concern Winter and early spring Common hosts Maple Sweetgum Ash Apple Mango Citrus