棉花黄萎病是由Verticillium dahliae侵染所致的维管束病害。棉株不同部位侵染程度明显不同,叶、茎部病菌侵染导管的百分半高于根部和果枝,其中叶部最高,果枝最低。从整个棉株看,由根到棉茎顶部病菌侵染导管数逐渐增多。病菌主要以菌丝和孢子的形态存在于导管内,同时也观察到导管内的胶状物和侵填体。 Verticillium dahliae is a vascular bundle disease caused by Verticillium dahliae infection. Cotton plants in different parts of the infection was significantly different, leaves, stems and pathogens invade the catheter half percent higher than the roots and fruiting branches, of which the highest leaves, fruiting branches the lowest. From the entire cotton plant, the number of pathogens invaded by roots to the top of cotton stems increased gradually. Pathogenic bacteria mainly in the form of mycelium and spores in the catheter, but also to observe the catheter jelly and tundish.