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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mycosphaerella coffeicola ： ウィキペディア英語版 Mycosphaerella coffeicola ''Mycosphaerella coffeicola'' is a sexually reproducing fungal plant pathogen. It is most commonly referred to as the asexual organism ''Cercospora coffeicola''. == Host and Symptoms == There are 40 species in the genus ''Coffea'' (family Rubiaceae) that are susceptible to the disease caused by ''M. coffeicola'', but only handful that are commercially relevant. Arabica coffee (''Coffea arabica'' L.) is the most significant of the susceptible species, making up 70% of the world's coffee production. ''Coffea arabica'' ranges in growth habit from a shrub to a small tree and has ovate, shiny, pointed leaves, with clustered white flowers.〔 Fruits begin as green berries which ripen to a deep red color. These are often called the coffee "cherries". Each fruit contains 2 seeds (i.e. coffee beans) in a drupe.〔 Symptoms of ''M. coffeicola'' vary depending on the plant organ in question. These differing symptoms help explain the various common names for the disease: ''Cercospora'' Leaf Spot and ''Cercospora'' Berry Blotch (in reference to the deuteromycete stage).〔 On leaves, lesions begin as chlorotic (yellow) spots that expand to become deep brown and necrotic on the upper leaf surface. These spots often have a discolored, light center where sporulation can occur, and many have a yellow "halo" around the margins. This halo is caused by the toxin cercosporin, produced by ''Cercospora'' species.〔 Not all lesions have distinct edges or a halo, however, and some occur in concentric rings. In general, lesions of this species are able to fuse, and can form large irregular areas of necrotic tissue.〔 Leaves may drop in extreme cases.〔 Fruit symptoms typically appear 90 days after flowering.〔 On green berries, this includes irregularly shaped brown, sunken lesions that are surrounded by a purple halo. Infected red cherries also have large, dark areas of sunken flesh. At this stage, fruit is susceptible to attack by opportunistic bacteria and fungi (such as ''Colletotrichum gloeosporioides''), though symptoms from these organisms should not be falsely attributed to ''M. coffeicola''.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mycosphaerella coffeicola」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.