Leaf spot diseases on orange trees are caused by fungus infections. While most leaf diseases will not kill a tree entirely, they should still be eliminated to avoid excessive leaf drop and promote healthy fruit.
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Leaf spots on orange trees typically begin as small round spots, sometimes raised, that range in colour from brown and black to yellow. Spots will increase in size if left untreated, often thriving in damp conditions.
Leaf spot diseases cause leaves to turn yellow and wither. Leaves will drop from the tree prematurely, decreasing the overall health of the tree. Leaf spot diseases can also hinder the growth of fruit.
Keeping a tree in overall health is the best way to prevent leaf spot from thriving. Prune trees annually, taking special care to remove all diseased branches or dead wood. Leaf spot diseases that respond to fungicide should be treated with chemicals at the first sign -- apply at least two treatments at seven-day intervals.
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