The prevalent internal cause was existence of the local bacterial source and loss of the resistant ability of wheat varieties, while the decisive factor was the abundant rainfall in spring.

当地菌源的存在和小麦品种的抗性丧失是发生大流行的内因，春季降水量多是大流行的决定性因素。

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The prevalent internal cause was existence of the local bacterial source and loss of the resistant ability of wheat varieties, while the decisive factor was the abundant rainfall in spring.

当地菌源的存在和小麦品种的抗性丧失是发生大流行的内因，春季降水量多是大流行的决定性因素。

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