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Downy mildew of radish caused by the funqus Peronospora parssitica (Pers. ex Fr.) Fr. Affecting vegetable crops in Varamih and Shahre—Ray area of Iran. Symptoms of the disease and morphology of the fungus were investigated and presented in this paper. Oospore were found abundantly in necrotic or chLorotic leaves and seed sheath, but not in green tissues.
Field experiments were conducted to-evaluate eight fungicides namely Thiophanate methyl, Cooper hydroxide, Cooper oxychloride, Carbandazim, Captan, Zineb, Maneb and Dodin against radish downy mildew. Cherybell and Champion radish cultivars were used in the present investigation. The results indicated that spraying once with zineb and Maneb were most effective.