Symptoms mainly damage the leaves. The lesioned leaves showed polygonal or square-shaped yellow lesions, and the corresponding leaves showed sparse white mold disease symptoms (sporangia and sporangia). In severe cases, lesions combined with plaque, resulting in a patch of leaf surface.
Pathogen? The pathogen is the flagellin subphylum of the genus Peronospora brassicae (P. parasitica (Pers.) Fr. var. brasscae).
The characteristics of the disease are the same as the pathogens and pathogenesis of downy mildew of large and small Chinese cabbage, but the physiological race of the pathogen may be different. There are differences in disease resistance among varieties.
Control methods? Refer to the control methods of downy mildew in Chinese cabbage.
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