作者通过试验发现：香蕉苗纹枯病的发生和发展都需要高湿度环境。相对湿度大于95％以上时有利于侵染的建立和病害的扩展；低于95％时，浸染发病受到一定的抑制；低于90％时．即使其他条件都满足，也很难建立侵染。当高湿度下成功浸染发病后再转到低于90％湿度时，病害扩展也很 The author found through experiments: banana leaf blight occurrence and development require high humidity environment. When the relative humidity is more than 95%, it is conducive to the establishment of the infection and the extension of the disease. When the relative humidity is less than 95%, the incidence of dissemination is inhibited to a certain extent; when it is lower than 90%. Even if other conditions are met, it is difficult to establish infection. Disease spread is also very high when the infection is transferred to less than 90% humidity after a successful dip in high humidity