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This article focuses on the downy mildew of soya bean. During the summer of 1959 a downy mildew was found on soya bean, variety Bansei, being grown for seed in Suffolk, England. The identity of the fungus, Peronospora manshuriea Syd., was confirmed at the Plant Pathology Laboratory in Harpenden. Infection is thought to have come in with the seed from the U.S., where the disease is general in some regions, but tests at Harpenden on a small quantity of the unsown seed failed to confirm seedborne infection.