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棉花黄萎病广泛分布于世界各主要产棉国家,也是我国棉花上的主要病害。由于带菌棉籽是其远距离传播的主要途径,故被列为我国国内的植物检疫对象。据1982年全国普查的不完全统计,黄萎病已蔓延到11省、市的363个集中产棉县,病田面积共计833万亩。特别引起人们注意的是,1980年在南通县恒兴公社的局部棉田里发现一种落叶型症状的黄萎病,其致病力比北方棉区的非落叶型的强致病类型——陕西泾阳菌系还强。发病株率高达90.0％,病情指数为72.9,并在落叶症状,发病强度等方面与美国强致病力的棉花黄萎病落叶型菌系——T-9很相似。
Verticillium wilt is widely distributed in all major cotton producing countries in the world and is also a major disease on cotton in China. As cottonseed is the main way of its long-distance transmission, it is listed as China’s domestic phytosanitary object. According to the incomplete statistics of the 1982 national census, Verticillium wilt has spread to 363 cotton-producing counties in 11 provinces and municipalities with a total area of 833 mu. Particularly noteworthy is the discovery of a defoliation-type Verticillium wilt in local cotton fields in Hengxing commune of Nantong County in 1980, which was more pathogenic than that of the non-deciduous type of virulent disease in northern cotton - Shaanxi Jing Yang bacteria is also strong. The incidence of disease was as high as 90.0%, and the disease index was 72.9. It was very similar to the defoliating filamentous strain -T-9 of the U.S. virulent cotton verticillium wilt in the aspects of deciduous symptoms and disease severity.