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棉花黄萎病是一种维管束病。中脉的不同部位(基部、中部和顶部)病菌侵染的程度有明显不同。一般由基部向顶部,病菌侵染导管的百分率,由小到大。同时在某些导管中尚可见到胶状物质或侵填体。侵染导管的菌丝形状有二种,一种较粗,黄褐色;另一种较细,暗褐色,后一种比较普遍。黄萎病可以根据病叶感病的状况分为四级。在基部菌丝侵染的导管数量与外部症状之间,没有一定的相关关系。不过,如果把被菌丝侵染的导管与被胶状物质充塞的导管,以及含有侵填体的导管合并计算时,似可看到一些关系。
Verticillium wilt is a vascular disease. The extent of infection by bacteria in the different parts of the midrib (base, middle and top) differed significantly. Generally from the base to the top, the percentage of bacteria invade the catheter, from small to large. At the same time in some catheters can still see the gel material or tundish. There are two types of mycelium infection catheter, a thick, brown; another faint, dark brown, the latter is more common. Verticillium wilt can be divided into four grades according to the diseased leaves. There was no correlation between the number of catheters infested with basal mycelium and external symptoms. However, if mycotic-infused catheters are combined with catheters stuffed with jelly material and catheters with tampons, some relationship seems to be visible.