用病菌培养滤液对幼苗浸根可使烟草幼苗叶片快速萎蔫，叶缘干缩。
Quick wilting of tobacco seedling was resulted from cultured filtrates by seedling root-soaking. Wilting symptom appeared and leaf margin dried-up.
出现可恢复性萎蔫或是无明显症状，为害比较轻微的定为1级，百叶10头以下的为害属于1级；
The symptom that there are restorable wilt or indistinct-symptom and lighter harm were classified as 1st, the symptom under 10/hundred leaves was belonged to 1st.
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