小枝中的病原菌为黑斑病主要初侵染来源。
病害发生与牡丹不同品种、初侵染源等因子密切相关。
The occurrence of disease was closely correlated to the initial infection sources and species of peony tree.
结果表明，大麦赤霉病抗性除了抗初侵染外还存在抗扩展类型。
The result showed there was the resistance to spread as well as to initial infection of Fusarium head blight in barley.
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