棉疫病引起棉花死苗、烂铃,是棉花主要病害之一。其中棉铃疫病是我国棉区棉花铃期的主要病害,发病率和危害性居各种铃病之首,对棉花生产影响极大,尤其在秋雨偏多的年份为害更重。棉苗疫病在我国南方棉区有造成大量死苗的报道。棉苗疫病在幼茎上的症状与棉苗立枯病的症状相似,两者极易混淆,这在棉苗疫病的田间诊断中应引起注意。1 棉疫病的发生和分布 Cotton disease caused by dead cotton seedlings, rotten bell, cotton is one of the major diseases. Among them, bollworm blight is the main disease of cotton boll stage in cotton area of ​​our country. The morbidity and risk are the first among various bollworms and have a great impact on cotton production, especially in the year with too much autumn rain. Cotton seedling disease in southern cotton area has caused a large number of dead seedlings reported. The symptoms of cotton seedling blight on young stems are similar to the symptoms of cotton seedling blight, which can be very confusing and should be noted in the field diagnosis of cotton seedling blight. 1 The occurrence and distribution of cotton blight