棉花苗期病害种类很多,主要分为种子传病及土壤傅病的两种类型。由种子傅病的,如炭疽病、角斑病、茎枯病、红腐病等,由土壤传病的,如立枯病、、红腐病、猝倒病等,其中为害根部的为立枯、红腐、猝倒、炭疽,常造成大片死苗是苗病中主要的为害种类,也就是苗病防治的主要对象。为害叶部的则为角斑病、茎枯病、轮纹斑病、褐斑病等,发病较迟,为害亦较轻。病害的种类常因地区分布而不同,且在同一地区亦可因逐年气象环境的不同而种类有改变。各种类分 There are many kinds of cotton seedling diseases, which are mainly divided into two types: seed transmission disease and soil disease. Fu disease from the seeds, such as anthracnose, angular leaf spot, stem blight, red rot, etc., from the soil disease, such as the blight, red rot, damping off disease, which damage the roots of legislation Dry, red rot, cataplexy, anthrax, often resulting in large dead seedlings are the main types of disease in seedling disease, that is, the main object of disease prevention and control. Leaf damage is angular leaf spot disease, stem blight, ring leaf spot disease, brown spot disease, later onset, damage is also lighter. The types of the diseases are often different according to the distribution of the regions. In the same area, the types of the diseases may also vary due to the meteorological environment of each year. Various types of points