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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 Rhytisma acerinum ： ウィキペディア英語版 Rhytisma acerinum ''Rhytisma acerinum'' is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing Tar Spot. Tar Spot does not usually have an adverse effect on the trees' long-term health. ''R. acerinum'' is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite.〔Roland W.S. Weber and John Webster (2002). Teaching techniques for mycology: 18. ''Rhytisma acerinum'', cause of tar-spot disease of sycamore leaves. Mycologist, 16 , pp 120-123〕 The disease is cosmetic and is therefore usually controlled only with sanitation methods.〔Hudelson, Brian. Wisconsin Horticulture UW-Extension Cooperative Extension. UW-Madison Plant Pathology, April 25, 2004. Web. Oct. 22, 2011.〕 ==Symptoms and signs== In late spring, chlorotic spots appear on tree leaves. These develop into brown-black lesions, retaining the yellow border.〔 The lesions continue to grow, and by the end of summer form a leaf spots that look like tar.〔 The spot can grow up to in diameter.〔 A microscopic sign of the pathogen are the stroma, mats of hyphae found in the lesions.〔 These lesions can cause senescence of leaves but are mostly of cosmetic importance. 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「Rhytisma acerinum」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.