对酶活性与田间感病指数作相关分析，发现SOD和POD活性与田间发病指数存在明显的正相关关系。

For the same variety, the SOD and POD activity was positively correlated with the field disease-infected index.

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根据感病损失量方程，病情很轻时损失甚微，经相对误差限法分析，将病情指数26定为该病的发生指标。

The developmental threshold was fixed at 26 of disease index based on the relative error margin analysis.

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