人参立枯病和猝倒病是人参苗期的两大病害,常造成大片参苗死亡。若防治不力,会给人参的生产带来严重损失。一、症状1.立枯病幼苗发病部位主要在土表下的茎部。感病初期茎上表皮组织出现黄褐色病斑,以后逐渐扩大,呈黄褐色凹陷长斑,茎基部收缩变细,最后病株折倒枯死,造成大片死苗。 Ginseng blight and damping-off disease are the two major diseases at the seedling stage, often resulting in death of large-scale ginseng. If the prevention and treatment is ineffective, it will bring serious losses to the production of ginseng. First, the symptoms 1. Dwarf disease seedling disease site mainly in the soil under the stem. In the early stage of the disease, the epidermal tissue of the stem appeared yellowish-brown spots, and then gradually enlarged. The spots became dark brown with long spots and the base of the stems contracted and thinned. Finally, the diseased plants were folded and died, resulting in large dead seedlings.