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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 Alternaria mali ： ウィキペディア英語版 Alternaria mali ''Alternaria mali'', also called Alternaria blotch of apple, is a pathogenic fungus affecting plants. It is prevalent in the southern United States and elsewhere, and damages the leaves of infected apple trees. == Pathogenesis == ''A. mali'' can overwinter as mycelium on dead leaves on the ground, in mechanical injuries in twigs, or in dormant buds.〔 Primary infection occurs about one month after petal fall the following year.〔 The disease is favoured by temperatures between 77 and 86 °F (25–30 °C), and by wet conditions.〔 Infection occurs at optimum temperatures with 5.5 hours of wetting,〔 and an outbreak can become serious within two days of infection. The fungus attacks susceptible cultivars using a chemical toxin.〔 Affected plants exhibit circular spots on the leaves that enlarge as the disease advances. Normally, hyphae cannot adhere to the surface of the host, but under moist conditions light-grey mycelium might be present on the surface.〔 Normally the fungus will not attack fruits except in highly susceptible cultivars;〔 fruit-spotting may occur on the tree or in storage, particularly on fruits with already damaged skin.〔 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「Alternaria mali」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.