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Spot blotch is a leaf disease of wheat caused by ''Cochliobolus sativus''.〔 〕〔 〕 ''Cochliobolus sativus'' also infects other plant parts and in conjunction with other pathogens causes common root rot and black point. == Introduction == Foliar blight or Helminthosporium leaf blight (HLB) or foliar blight has been a major disease of wheat (Triticum aestivum L.) worldwide. Foliar blight disease complex consists of spot blotch and tan spot. Spot blotch is favored in warmer environments whereas tan spot is favored in cooler environments such as United States. 〔(Marcia McMullen (2009) Extension Plant Pathologist, Department of Plant Pathology, Fungal Leaf Spot Diseases of Wheat: Tan spot, Stagonospora nodorum blotch and Septoria tritici blotch, PP-1249 (Revised), February 2009 )〕 The tan spot forms of foliar blight appears in United States causing significant yield loss. With changed climatic conditions the disease is supposed to be increasing in cooler parts of the world. Among foliar blights the tan spot, caused by Pyrenophora tritici-repentis, is the most destructive leaf spot disease found in all wheat classes throughout the growing season across North Dakota.〔 The spot blotch form of foliar blight is severe particularly in warmer growing areas characterized by an average temperature in the coolest month above 17 °C. In the past 20 years, HLB has been recognized as the major disease constraint to wheat cultivation in the warmer eastern plains of South Asia.〔Rosyara, U. R.; E. Duveiller, K. Pant and R. C. Sharma. 2007. Variation in chlorophyll content, anatomical traits and agronomic performance of wheat genotypes differing in spot blotch resistance under natural epiphytotic conditionsAustralasian Plant Pathology 36: 245–251.〕〔(Proceedings of HLB symposium by CIMMYT (pdf download) )〕 25 millions of non-traditional wheat growing area are under the pressure of the disease. See: (Knowing the Enemy: Foliar Blight ) 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「Spot blotch (wheat)」の詳細全文を読む スポンサード リンク
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