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From Wikipedia, the free encyclopedia. Leaf curl is a plant disease characterized by curling of leaves, and caused by a fungus, genus Taphrina, or virus, especially genus Begomovirus of the family Geminiviridae.One of the most notable types is peach leaf curl, caused by the fungus Taphrina deformans, which infects peach, nectarine, and almond trees.Taphrina deformans is found in America, Europe, Asia, Africa, Australia, and New Zealand.It was first introduced in America in 1852 and has now spread all over the country.ne of the most notable types is peach leaf curl, caused by the fungus Taphrina deformans, which infects peach, nectarine, and almond trees. Taphrina deformans is found in America, Europe, Asia, Africa, Australia, and New Zealand. It was first introduced in America in 1852 and has now spread all over the country.
1. What's causing the leaves of my citrus trees to be curled and crinkled? Two Possibilities: Citrus Leaf Miner Damage This insect is the maggot of a tiny fly that lays eggs into the leaves. Maggots hatch from the eggs and mine their way through the leaves causing them to cup and crinkle.quiggly lines can also be seen in the affected leaves. This insect is not harmful to the health or fruit production of established trees. Young citrus trees may benefit from sprays of horticulture oil which interfere with the fly's ability to lay eggs into the leaf.