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三七黑斑病发病期为5～9月,其间有5个高峰期,最高峰为9月,发病率达56.30％。用玉米杆作荫棚材料,发病率和病情指数均高于杉树枝做天棚的七园。
The incidence of black spot disease of Panax notoginseng is from May to September, with 5 peak periods and the highest peak of September, with a morbidity of 56.30%. The use of corn stalks for shade materials, the incidence and disease index were higher than the fir tree branches to do the seven parks.