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小麦纹枯病由角担菌属病菌引起的一种真菌病害,主要寄生小麦、大麦等禾本科植物,分布于长江中下游流域各省,已成为小麦主要病害。一、症状和诊断。小麦苗期得病后,病部初呈暗绿色小斑,后随着病情的发展,逐渐扩大成云纹状大斑。潮湿条件下,病部出现白色菌丝体,有时出现白色粉状物。后期病部表面产生褐色菌核。受害植株,苗期叶片由下至上退绿变黄,常于麦苗受渍后叶黄相似,影响光合作用,使麦苗生长发育不良;返青拔节期若
Wheat sheath blight is a fungal disease caused by the hornbeamia bacteria. Mainly parasitic plants such as wheat and barley distribute in the provinces in the middle and lower reaches of the Yangtze River and have become the major diseases of wheat. First, the symptoms and diagnosis. Wheat seedling disease, disease early dark green patches, with the development of the disease, gradually expanded into a large cloud-shaped spots. Wet conditions, the disease appeared white mycelium, sometimes white powder. Late stage of the surface of the Ministry of bacteria produce brown sclerotia. Damaged plants, the seedling leaves turn green from the bottom up yellow, often in wheat seedlings after the stain leaves similar to yellow, affecting photosynthesis, malt growth and development;