Sunscald on citrus trees usually happens during hot and dry weather conditions, so it's very important to watch out for them everytime it gets hot. If certain parts of your citrus trees are too exposed to sunlight, citrus sunburn occurs and results into damage specially in the bark. Just like other fungal diseases, citrus sunscald is impossible to treat but prevention is the best way to deal with them before it can further cause damage to your citrus trees.

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Source: Gardening Know How