论文部分内容阅读
一、发病症状1.苗期。病初茎基或叶柄处生有红褐色斑点,后扩大变为白色斑块,逐渐腐烂,上面长出白色絮状菌丝,如病斑绕茎后幼苗则死亡。
First, the onset symptoms 1. Seedling. At the beginning of the disease, there were reddish-brown spots on the stems or petioles, enlarged into white patches and gradually decayed, and the white flocculent mycelia grew above them.