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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.
The damage may appear as tiny or large holes in the leaf, or as irregularly shaped leaves with jagged edges. If plant leaves are still growing when the insect feeds, the damage may later appear to have smooth edges around the feeding holes. Only insects cause these types of damage. Leaf curling, puckering or rolling The saliva of some sucking insects, especially aphids, may cause plant leaves to fold, curl or pucker. These insect symptoms can be confused with some plant diseases that cause similar symptoms.