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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 Northern corn leaf blight ： ウィキペディア英語版 Northern corn leaf blight Northern corn leaf blight (NCLB) is a foliar disease of corn (maize) caused by ''Exserohilum turcicum'', the anamorph of the ascomycete ''Setosphaeria turcica''. With its characteristic cigar-shaped lesions, this disease can cause significant yield loss in susceptible corn hybrids. ==Hosts and symptoms== There are several host-specific forms of ''E. turcicum''. The most economically important host is corn, but other forms may infect sorghum, Johnson grass, or sudangrass. The most common diagnostic symptom of the disease on corn is cigar-shaped or elliptical necrotic gray-green lesions on the leaves that range from one to seven inches long. These lesions may first appear as narrow, tan streaks that run parallel to the leaf veins. Fully developed lesions typically have a sooty appearance during humid weather, as a result of spore (conidia) formation. As the disease progresses, the lesions grow together and create large areas of dead leaf tissue. The lesions found in Northern corn leaf blight are more acute if the leaves above the ear are infected during or soon after flowering of the plant. In susceptible corn hybrids, lesions are also found on the husk of ears or leaf sheaths. In partially resistant hybrids, these lesions tend to be smaller due to reduced spore formation. In highly resistant hybrids, the only visible disease symptoms may be minute yellow spots.〔Wise, Kiersten (2011). "(Diseases of Corn: Northern Corn Leaf Blight )". Purdue University Extension Publication. Purdue University.〕 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「Northern corn leaf blight」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.