一、防治黄锈病黄锈病(Vredo panacis syd)是三七常见和危害较大的一种病害,早春被害的嫩叶,在叶背呈密密麻麻如针头大小突起的黄色锈病斑(孢子堆),病叶边缘向上卷曲,叶片不能展开。叶面被危害后,逐渐黄化穿孔,病斑四周产生放射状锈粉,呈菊花或鸡爪状,严重时落叶光杆,块根停止生长。此病不但为害叶片,也能促使花朵萎黄,果实干枯脱落。病菌在病枝叶和根茎上潜伏越冬,翌年侵 First, the prevention and treatment of yellow rust Yellow rust (Vredo panacis syd) is a common and more serious Panax disease thirty-seven, young victims of early spring leaves on the leaf back was dense, such as needle size protruding yellow rust spots (spores heap), disease Leaf edge curled up, leaves can not expand. After the leaves were harmed, yellowing and perforation were gradually formed. Radial rust around the spots formed chrysanthemum or chicken-claw-like shape. In severe cases, the leaves were stopped and their roots were stopped growing. The disease not only damage the leaves, but also to promote flower chlorosis, fruit dry off. Pathogenic bacteria in the diseased leaves and rhizome latent winter, the following year invasion