叶枯病多从叶缘、叶尖侵染发生，病斑由小到大不规则状，红褐色至灰褐色，病斑连片成大枯斑，干枯面积达叶片的1/3-1/2，病斑边缘有一较病斑深的带；病健界限明显。常见于植物之中，该病在7-10月份均可发生。植株下部叶片发病重。高温多湿、通风不良均有利于病害的发生。植株生长势弱的发病较严重。
说明SA能诱导水稻幼苗对白叶枯病的系统抗性。
It indicated that SA had induced systemic resistance to bacterial blight in rice seedlings.
这种基因最常见的形式可以让水稻更容易感染白叶枯病，但是它同时也会让水稻产生更多花粉。
The most common form of the gene makes rice plants more susceptible to bacterial leaf blight but also makes them produce more pollen.
着重分析了各病害生态区白叶枯病发生流行特点及原因，提出了相应的防治对策。
In this paper, the characteristics and possible causes of prevalence of rice blight in different geographical regions were discussed with respect to countermeasures of control.
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