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leaf curl
Leaf curl is a plant disease characterized by curling of leaves, and caused by a fungus, genus ''Taphrina'',〔(Peach leaf curl, ''Taphrina deformans'' ) at West Virginia University〕 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.〔Gray, William D.. The Relation of Fungi to Human Affairs. New York: Henry Holt and Company, Inc., 1959. Print.〕 It was first introduced in America in 1852 and has now spread all over the country.〔Chester, Kenneth Starr. Nature and Prevention of Plant Diseases. 2nd. Philadelphia: The Blakiston Company, 1947. Print.〕
== Problems with leaf curl ==
Peach leaf curl reduces the amount of leaves and fruit produced by peach and nectarine trees.〔 The disease costs the United States 2.5 to 3 million dollars annually.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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