洋葱黑粉病是一种土壤传染性病害。最早为1834年潘松(Persoon)在欧洲采到,嗣后1869年在美国康纳铁坎河流域发现有此病发生,法国和德国于1879年有发生的报导,以后广泛流行于欧洲各国。自1938年后,始在欧洲和美国以外的国家发现。根据手头查到的资料,目前已发生洋葱黑粉病的国家有:美、英、法、德、意、加拿大、苏联、新西兰、西班牙、瑞士、苏格兰、波兰、荷兰、罗 Onion powdery mildew is a soil-borne disease. As early as 1834, Persoon was taken in Europe. Subsequently, the disease was found in the Connot Tinker River basin in 1869 in the United States. France and Germany reported in 1879 and became widely prevalent in European countries. Since 1938, it was discovered in countries outside Europe and the United States. According to the information found at hand, the current occurrence of onychomycosis countries: the United States, Britain, France, Germany, Italy, Canada, the Soviet Union, New Zealand, Spain, Switzerland, Scotland, Poland, the Netherlands, Luo