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棉花枯萎病在全国主要产棉区普遍发生。近几年来,老病区的病情逐年加重,新病区蔓延迅速,严重影响棉花产量的提高。目前行之有效的防治途径之一是选育和推广抗病品种。各地枯萎病菌对不同棉花品种致病力有所差异,例如鄂光棉在湖北表现良好,但在陕西严重感染枯萎病;新疆北部的菌系为害海岛棉,但在病田里补种陆地棉后很少发生枯萎病。因此摸清各地菌系的生理型及其致病力在抗病选种和品种布局上具有重要意义。过去认为枯萎病菌的专化性较强,棉花枯萎菌是尖孢镰刀菌这个种内的一个变
Fusarium wilt occurs in the main cotton producing areas in the country. In recent years, the condition of the old ward has been increasing year by year with the rapid spread of the new ward, which seriously affected the increase of cotton yield. At present, one of the effective prevention and cure ways is breeding and popularizing disease-resistant varieties. Fusarium oxysporum isolates from different regions showed different pathogenicity to different cotton varieties. For example, E Guangmian performed well in Hubei Province, but seriously infected with Fusarium wilt in Shaanxi Province. However, Fusarium disease rarely occurs. Therefore, to find out the physiology of all strains of bacteria and their virulence in disease-resistant selection and variety of layout is of great significance. Fusarium wilt bacteria in the past that the more specialized, Fusarium oxysporum cotton Fusarium this species within a variable