棉花苗期病害种类多,且为害重,多发生在棉花播种后10～45天,一般发病株率为10～30%,高达50～60%,严重地块高达90%以上。轻者造成僵苗迟发,形成老小苗,重者导致成片死苗,造成缺苗断垄,甚至毁种重播,对棉花的生长发育,产量和品质影响很大。因此必须引起棉农的高度重 Cotton seedling diseases are many and harmful weight, occurred in the cotton 10 to 45 days after sowing, the general incidence of plant rate of 10 to 30%, up to 50 to 60%, a serious block up to 90%. Light caused delayed emergence of stiff Miao, the formation of old seedlings, severe cases lead to dead seedlings, resulting in lack of seedlings broken ridge, and even replanted, the growth and development of cotton, yield and quality of a great influence. Therefore, we must arouse the height of cotton farmers