四个优系处理与对照相比，均降低了两种病害的发病率、发病指数和发病程度；
The incidence, index and epidemic degree of the two disease decreased comparing with CK after choice ;
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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