Abstract
Flixweed (tansy mustard) has been used in Chinese medicine since the Han Dynasty (ca. AD 200) (Jiangsu New Medical College, 2000), and it is widely cultivated in China due to its medicinal values. However, downy mildew caused by Hyaloperonospora sisymbrii-sophiae is a major constraint to flixweed’s cultivation (Zhou Songdong et al., 2001). This disease produces large portions of well-defined yellow spots on the leaf. The corresponding lower surface of the leaf displays typical white downy growth symptoms, and the pathogen infects the leaf, stem, pedicel, flowers, and pods. During November 2012, flixweed seedlings were observed with characteristics of downy mildew symptoms in the fields of the Shangqiu region of Henan Province, China. On the upper leaves, the lesions were first seen as irregular, less discrete yellowish spots. Over time, a white mildew layer developed on lower leaves. The infection resulted in chlorosis to the entirely necrotic leaves with white mildew on both the upper and lower surfaces....
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