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.
试验证明，侵染源和人参处于不良环境是诱发病害的两个主导因素。
Invading-infectious causes and bad environments are two main factors inducing the disease.
富含胆碱的残留花药、雌蕊及早期颖果是禾谷镰孢菌的主要初侵染源；
Besides anthers at anthesis, pistils and young caryopses are rich in choline and are the main sites of the initial infection.
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