牡丹红斑病在山东菏泽牡丹栽培区的发病率达50％左右,病重的牡丹园可达90％以上。从8批次384个样 品中分离获得512个分离株,经筛选、纯化、回接试验,依其培养性状和形态特征,病原菌鉴定为牡丹枝孢Cladosporium paeoniae Pass．。病害发生与牡丹不同品种、初侵染源等因子密切相关。筛选出了50％多菌灵、700k,甲基托布津 等防治红斑病的有效药剂,应用800倍液从3月中旬牡丹展叶前至7月中旬防治4次,效果达90％以上,感病指数 可控制在5以下。 Peony leaf spot in Shandong Heze peony cultivation area incidence rate of about 50%, the weight of the Peony Garden up to 90%. A total of 512 isolates from 384 samples of 8 batches were obtained and screened, purified and returned to the test. According to their culture traits and morphological characteristics, the pathogen was identified as Cladosporium paeoniae Pass. . The occurrence of diseases is closely related to different varieties of peony and primary infection sources. The effective agents of 50% carbendazim, 700k, thiophanate-methyl and so on were screened out. The application of 800 times of liquid was controlled from Peony before mid-March to mid-July and the effect was over 90% Disease index can be controlled below 5.