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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.
Spiral : ( one or more leaves per node ) When a spiral pattern is formed when an imaginary line is drawn which connects progressively older leaf origins on the stem. 3. Opposite : ( two leaves per node ) When two leaves arise at each node opposite to each other the phyllotaxy is opposite. When each pair at each node is placed at right angles to one another the condition is opposite decussate e.g. Calotropis, Guava etc. If all the pair occur in same line the phyllotaxy in opposite superposed e.g. Jaman. 4. Whorled : ( three or more leaves per node ) When more than two leaves arise at each node in a whorl the phyllotaxy is whorled e.g. Oleander.