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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 Septoria musiva ： ウィキペディア英語版 Septoria musiva ''Septoria musiva'', correct taxonomic name: ''Sphaerulina musiva'' (teleomorph: ''Mycosphaerella populorum''), is an ascomycete fungus responsible of a leaf spot and canker disease on poplar trees. It is native on the eastern cottonwood poplar ''Populus deltoides'', causing only a leaf spot symptom. On susceptible hybrid poplars, ''S. musiva'' causes necrotic lesions on the leaves which lead to premature defoliation, and cankers on the stem and branches which can reduce growth, predispose the tree to colonisation by secondary organisms, and cause stem breakage. In 2013, Quaedvlieg et al. introduced a new combination for this species: ''Sphaerulina musiva'' (Peck) Quaedvlieg, Verkley & Crous, as they found that the type strains of both the genus ''Mycosphaerella'' (linked to the anamorph genus ''Ramularia'' via ''Ramularia endophylla'') and the genus ''Septoria'' (linked to the anamorph genus ''Septoria'',via ''Septoria cytisi'') clustered separately from the clade containing ''Sphaerulina musiva''. == Distribution and hosts == ''Sphaerulina musiva'' is distributed in northeastern North America sympatrically with the native eastern cottonwood ''P. deltoides'', on which the disease is limited to a leaf spot symptom. These endemic leaf spots on ''P. deltoides'' are believed to constitute a source of inoculum for hybrid poplar plantations. ''S. musiva'' has sometimes been reported on Tacamahaca poplars indigenous to North America (''P. trichocarpa'' and ''P. balsamifera'') and on their hybrids. For example, in 2006, a high incidence of stem infections caused by this fungus was observed on ''P. balsamifera'' in a plantation within its native range in northern Alberta. ''S. musiva'' leaf spots have also been observed on willow trees, as ''Salix lucida'' spp. ''lucida''. Until 2006, plantings of potentially susceptible clones in the Pacific Northwest region of North America remained free of Septoria canker disease but since this date, cankers caused by this disease have been observed on a regular basis in two hybrid poplar nurseries located in the Fraser Valley of British Columbia. 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「Septoria musiva」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.