本文对褐(紫)鞘、鞘腐两种症状的诱发因子进行了描述。采用不同的接种方法,将不同来源的菌株在常规的水稻品种上接种,均可引起褐(紫)鞘和鞘腐二种症状,它们出现的频率随接种方法、品种和菌株的不同而异。作者认为把褐(紫)鞘症状看作为一种新的病害是不能成立的,它只能是水稻叶鞘腐败病的另一种症状。 This article describes the brown (purple) sheath, sheath rot two symptoms induced factor described. Different inoculation methods, inoculating different strains of strains on conventional rice varieties can cause both symptoms of brown (purple) sheath and sheath sheath, and their occurrence frequency varies with the method of inoculation, variety and strain. The author believes that the brown (purple) sheath symptoms as a new disease can not be established, it can only be another symptom of rice leaf sheath rot disease.