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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 Podosphaera macularis ： ウィキペディア英語版 Podosphaera macularis ''Podosphaera macularis'' (formerly ''Sphaerotheca macularis'') is a plant pathogen infecting several hosts including chamomile, caneberrie, strawberries, hop, hemp and ''Cineraria''. It causes powdery mildew of hops. == Host range and symptoms of ''Podosphaera macularis'' == The pathogen that causes powdery mildew of hops was once considered to be ''Sphaerotheca macularis'', which is capable of infecting many plants; however, in recent years, the pathogen that causes powdery mildew of hops has been taxonomically classified as ''Podosphaera macularis''. This ascomycete is only pathogenic on hop plants, including both ornamental and wild hops. The host range of many ''Podosphaera macularis'' strains is restricted by the existence of resistant hop varieties, such as the “Nugget” variety of Washington state and Oregon, although in recent years, resistance within this hop variety has been overcome in the laboratory. When disease does occur, early symptoms include chlorotic spots on the leaves of hop plants. Spots may fade to gray or white as the season progresses. Signs include white clusters of hyphae, which are often present on the leaves, and in some cases can infect the cone itself. If this infection occurs, a brown, necrotic lesion may develop. Occasionally, chleistothecia are visible as small, black dots on the undersides of leaves. 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「Podosphaera macularis」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.