甘蔗赤腐病分布很广,甘蔗产区均有发生,该病从苗期直到成株及收获后均可发生。苗期发病后,常造成严重缺株,成株期发病,不仅影响正常生长发育,且会导致茎秆腐烂。收获后在贮藏期间发病,也会引起蔗杆腐烂降低甘蔗含糖量,甚至失去使用价值。一、病害症状。叶片上发病时,在中脉上发生红色长形条斑,病斑的边缘为暗红色,中央褪为白色,最后病斑上出现黑点(病菌的分生孢子盘)。叶鞘感病时,生红色大型病斑。茎部被害时,从外表上看,没有明显的症状,但内部节间组织却已变成暗红色,往往还夹杂着白色组织,后期由于病情的加 Sugarcane red rot is widely distributed, sugar cane production areas have occurred, the disease from the seedling until the adult and after harvest can occur. Seedling incidence, often resulting in serious lack of strains, adult disease, not only affects the normal growth and development, and will lead to stalk rot. After harvest during the disease, will also cause cane stem decay reduce the sugar content of sugarcane, or even lose the use value. First, the symptoms of disease. Occurrence of the leaves, the red pulse occurs in the midrib spot, the edge of the lesion is dark red, the central faded to white, the last spot on the black spots (pathogenic bacteria conidia disk). Leaf sheath disease, red large lesions. Stems were killed, from the appearance point of view, no obvious symptoms, but the internal node tissue has become dark red, often mixed with white tissue, the latter due to the disease plus