稻白叶枯病是一种维管束内的细菌性病害。这种病害的病原菌,侵入稻叶后,需要在维管束内繁殖到一定的程度,稻叶才表现症状。在稻叶表现症状前,这些部位实际上已感病。对于这些外表未现症状内有病菌侵害的感病部位,叫做“潜伏病斑”。从病菌侵入到表现症状这段时间称为潜伏期。根据“潜伏病斑”和“潜伏期”的存在,1975—1976年,我们先后在浦北县北河大队和北流 Rice bacterial blight is a bacterial disease within the vascular bundle. Pathogens of this disease, invade rice leaves, the need to breed in the vascular bundle to a certain extent, rice leaves only show symptoms. Before the performance of rice leaf symptoms, these parts have actually been susceptible. For these appearances are not infected with pathogens within the affected parts of the disease, called “latent lesion.” From the invasion of bacteria to the performance of this period of time known as the incubation period. According to the existence of “lurking lesion” and “incubation period”, from 1975 to 1976, we worked successively at Beihe Brigade and Beiliu of Pubei County