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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 Heterobasidion occidentale ： ウィキペディア英語版 Heterobasidion occidentale ''Heterobasidion occidentale'' is a tree root-rotting pathogenic fungus in the family Bondarzewiaceae. It is endemic in western North America west of the Rocky Mountains from Alaska to southern Mexico. While a natural agent of forest turnover, ''H. occidentale'' has become of increased concern due to forest management processes such as pre-commercial thinning, altered site density and species composition, and carbon sequestration. ''H. occidentale'' forms part of the genus that includes other species forming the important forest pest ''Heterobasidion annosum'' ''sensu lato'' that is spread across the Northern Hemisphere. ''H. occidentale'' is part of the S-type intersterility group differing from the other North American species, ''Heterobasidion irregulare''. ==Distribution== ''H. occidentale'' is found in Western North America from Alaska to Southern Mexico. It is found as far inland as Colorado and Montana, but has not been observed east of the Rocky Mountains. The incidence is of highest importance in stands of intensive silviculture, such as Christmas tree plantations. It is also of high importance to the ''Abies religiosa'' forests in Central Mexico that are the winter home for the monarch butterfly (''Danaus plexipus''). ''H. occidentale'' affects several species of trees including major hosts including Douglas-fir (''Pseudotsuga menziesii''), western hemlock (''Tsuga heterophylla''), and various fir (''Abies'') species.〔 Other notable hosts include sitka spruce (''Picea sitchensis'') as well as numerous deciduous trees such as red alder (''Alnus rubra''), bigleaf maple (''Acer macrophyllum'') and pacific madrone (''Arbutus menziesii''). Ornamental and landscape trees are seldom affected. This contrasts the Eurasian S-type species, ''H. parviporum'', which has a fairly strict host range of spruce, fir, and larch. 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「Heterobasidion occidentale」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.