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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 Koa wilt ： ウィキペディア英語版 Koa wilt Koa Wilt is a relatively new disease to Hawaii, discovered in 1980. Koa Wilt is caused by the fungus Fusarium oxysporum, which is now abundant in Hawaiian soils and infects the native Acacia koa tree, a once-dominant species in the canopy of Hawaiian forests. ''F. oxysporum f.sp. koae'' is believed to have been brought into Hawaii on an ornamental acacia plant.〔Friday, J. B., and Nicholas Dudley. "Hawai'i Forestry Extension: Koa Wilt." Hawai'i Forestry Extension: Koa Wilt. University of Hawaii, 31 Mar. 2013. Web. 23 Oct. 2014.〕 Fusarium fungi clog the tree xylem, causing significant wilt and mortality among these beautiful and iconic Hawaiian trees. ==Hosts and Symptoms== The host for Koa Wilt is Acacia koa, a tree that is native and endemic to the Hawaiian islands. It ranges in size from 15 to greater than 50 feet 〔University of Hawaii. "Acacia Koa." Native Plants Hawaii. University of Hawaii, 2009. Web. 23 Oct. 2014〕 with a canopy spread of 20 to 40 feet.〔Elevitch, Craig R., Isabella Aiona. Abbott, and Roger R. B. Leakey. Traditional Trees of Pacific Islands: Their Culture, Environment, and Use. Hōlualoa, Hawaiʻi: Permanent Agriculture Resources, 2006. Print.〕 It has a showy white flower and blooms sporadically. Mature leaves are sickle shaped.〔University of Hawaii. "Acacia Koa." Native Plants Hawaii. University of Hawaii, 2009. Web. 23 Oct. 2014〕 Koa wilt is typically a fatal pathogen for its host. In only a few months, a tree may lose its entire canopy and die. Trees less than fifteen years old are typically the most susceptible. Symptoms include stains in cambium, roots, and sapwood as well as chlorosis (yellowing), canopy dieback, brown and wilted leaves, oozing sap, and bark cankers.〔Friday, J. B., and Nicholas Dudley. "Hawai'i Forestry Extension: Koa Wilt." Hawai'i Forestry Extension: Koa Wilt. University of Hawaii, 31 Mar. 2013. Web. 23 Oct. 2014.〕 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「Koa wilt」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.