棉花苗期病害种类很多,常常引起种子腐烂、根茎和叶片发病,对于棉花的早苗、壮苗威胁很大。特别在长江中下游棉区,由于从棉花播种到苗期,天气阴湿多雨,气温冷暖多变,导致棉苗病害流行,常常造成缺苗断垄、甚至翻耕重种。棉苗红腐病是一种由真菌引起的病害,分布在我国所有植棉区,在大多棉区是苗期主要病害之一。其发病率高而普遍,一般年份为害较小,后期随棉苗长 Many varieties of cotton seedling diseases, often lead to decay of seeds, rhizomes and leaves of the disease, for the seedlings of cotton, strong threat to strong seedlings. Especially in the middle and lower reaches of the Yangtze River cotton area, due to sowing from cotton to seedling stage, the weather is wet and rainy, warm and changeable temperature, leading to cotton seedling disease epidemic, often resulting in lack of seedlings broken ridge, and even overturned. Cotton seedlings rot is a disease caused by fungi, located in all cotton-growing areas in China, in most of the cotton seedling stage is one of the major diseases. The incidence is high and common, less harmful in the general year, late with cotton seedling length