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s in China (Huang et al. 2017; Radisek et al. 2018). This is the first report to our knowledge of powdery mildew P. fusca on H. tuberosus in China. It could cause significant yield losses and become a threat to production of H. tuberosus .Ixeris denticulata (Houtt.) Stebb is an annual herbaceous plant in the family of Asteraceae, which is native to Europe or central Asia. This plant is widely distributed in China and is commonly used for edible and medicinal purposes. In February 2019, typical symptoms of powdery mildew were observed on 7