There are exponential curve correlation between SOD activity and the number of epiphyte spot and the area of single epiphyte,the same phenomena were founded between activity of POD and increasing current of epiphyte spot and percentage of bug in leaves.

• 从白粉菌侵染到发病高峰期,SOD活性与白粉菌菌斑数目增加趋势以及单个菌斑面积增加趋势呈指数曲线型相关; POD与白粉菌菌斑数目增加趋势和菌斑面积占总叶面积百分数的增加趋势呈指数曲线型相关;