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三麦纹枯病主要为害三麦基部茎节之叶鞘,形成典型的纹枯症状,严重的茎杆折断倒伏,造成减产,是江苏三麦生产中的一大威胁,1984—1986年间从江苏10市30县采集三麦典型病株110个,分离纯化共得74个菌株.经形态学、组织学和菌丝细胞融合鉴定,江苏引致三麦纹枯病的病原菌以禾谷丝核菌(Rhizoctonia cerealis)为主,普遍分布在江苏各麦区,少数麦区也有立枯丝核菌(R.solani)为害.禾谷丝核菌的主要特征是:菌落在25℃下生长较慢;菌丝短细;菌丝细胞隔膜
Three wheat sheath blight mainly on the base of the three wheat stems of the leaf sheath, the formation of typical symptoms of withered stems, severe stem collapse and lodging, resulting in reduced production is a major threat to the production of three wheat in Jiangsu, 1984-1986 from Jiangsu 10 A total of 110 typical diseased plants were collected from 30 counties and 74 isolates were isolated and purified.The pathogenic bacteria of Rhizoctonia solani (Rhizoctonia solani) were identified by morphology, histology and mycelial cell fusion. (cerealis), widely distributed in all wheat regions in Jiangsu Province, and R.solani was also found in a few wheat regions.The main features of R. cerealis were that colonies grew slowly at 25 ℃, mycelium Short thin; mycelium diaphragm