1. The Seedling of maize Varieties were inoculated with mix toxogen of BYDV or SGV、RPV、MAV (three strains of BYDV) in the green house and the experimental field.
   用大麦黄矮病毒(BYDV)的混合毒原及分离的4种株系，分别在温室和田间接种不同玉米品种幼苗。

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