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註釋Downy mildew (Peronospora parasitica) is among the major devastating diseases of crucifers world-wide. Hosts of this disease include canola, cabbage, cauliflower, broccoli, kale, and various ornamental plants. This publication is a detailed literature review on downy mildew of crucifers, arranged into sections discussing the following: the disease, its symptoms on different hosts, geographic distribution, yield losses, and disease assessment methods; the pathogen's taxonomy, variability, sporulation, perpetuation, and spore germination; host-pathogen interactions in the form of seed infection, host range, disease cycle, process of infection and pathogenesis, epidemiology, fine structure, biochemical changes, and biochemical compounds; host defence mechanisms; techniques for studying host-pathogen relationships; and management practices related to cultural control, chemical control, biological control, host resistance, and integrated disease management.