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于田间甜叶菊生长发育时期，系统调查黑斑病发病率及病情指数。结果表明：甜叶菊黑斑病田间发生动态呈“S”型生长曲型，符合逻辑斯蒂模型，病情发展出现两个高峰。甜叶菊黑斑病发生轻重主要受当年气象条件，尤其是降雨量的影响。药剂防治甜叶菊黑斑病以70％百菌清和70％复方甲基托布津最好，使用浓度为500倍液，尤其是70％百菌清残效期长，防效更好。
Stevia rebaudiana in the field during the growth and development, systematic investigation of the incidence of black spot disease and disease index. The results showed that there was “S” growth pattern in the field of Stevia alternata, which accorded with Logistic model and appeared two peaks in disease development. The severity of stevia black spot disease is mainly affected by the current meteorological conditions, especially rainfall. Pharmacological control Stevia black spot with 70% chlorothalonil and 70% compound thiophanate-methyl the best, the use of 500 times the concentration of liquid, especially 70% chlorothalonate residual effect period, better control effect.