浙江省棉花生产上的一个重要问题是苗期病害。它不但影响早苗、全苗、壮苗,而且土壤内积存的病菌和轻病未死苗,又是中后期棉株发生根腐和茎基腐的根源。棉田严重发病时,造成密度下降、棉株间生长不平衡、迟发及早衰等现象,造成棉花减产。据1973年和1975年的不完全统计,浙江省棉苗 An important issue in cotton production in Zhejiang Province is the seedling disease. It not only affects the early seedling, the whole seedling and the strong seedling, but also the bacteria in the soil and the undeveloped seedlings with the mild disease are the roots of root rot and stem rot in the mid-late cotton plant. Severe cotton disease, resulting in decreased density, uneven growth of cotton plants, delayed and premature aging and other phenomena, resulting in reduced cotton production. According to incomplete statistics in 1973 and 1975, cotton seedlings in Zhejiang Province