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药菊发生的霜霉病,病原为Peronospora danica Gaum,对菊花品种间致性有差异,不同品种表现的症状,菌丛色泽、稀密以及孢子囊展度亦有明显差异。
Downy mildew occurred in the drug-resistant chrysanthemum. The pathogen was Peronospora danica Gaum. There were differences in the inter-chrysanthemum varieties. The symptoms of the different varieties, the color of the bacterial flora, the density and the sporangia extent were also significantly different.