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为了筛选防治黄瓜疫病的有效药剂，研究了６种作用机理不同的杀菌剂及其两两混用对黄瓜疫病病菌生长的抑制作用．单剂以甲霜灵对疫霉菌生长的抑制作用最强，有效中浓度（ＥＣ５０）为０．３０１５μｇ／ｍＬ；敌克松的效果次之，ＥＣ５０为５．０１３２μｇ／ｍＬ．甲霜灵＋乙膦铝、甲霜灵＋百菌清、代森锰锌＋乙膦铝、代森锰锌＋百菌清、甲基托布津＋百菌清等５种组合有较明显的增效作用，其共毒系数（ＣＴＣ）分别是１５６．３６，１３９．６５，１６４．６４，２６６．３９和４２４．４．室内盆栽和大田试验的结果表明：甲霜灵＋百菌清、代森锰锌＋百菌清、甲基托布津＋百菌清对黄瓜疫病的防治效果好
In order to screen effective cucumber disease-controlling agents, six fungicides with different mechanism of action and two or two fungicides were used to inhibit the growth of Cucumber Blight. Metalaxyl had the strongest inhibitory effect on the growth of Phytophthora solani. The effective concentration (EC50) was 0.3015μg / mL. The effect of diketone was second, and the EC50 was 5.0132μg / mL. Metalaxyl + ethanaluminate, metalaxyl + chlorothalonil, mancozeb + ethylphosphine, mancozeb + chlorothalonil, thiophanate methyl + chlorothalonil and other 5 kinds of combinations have more obvious Synergism, the co-toxicity coefficient (CTC) were 156.36,139.65,164.64,266.39 and 424.4. The results of indoor pot experiment and field experiment showed that the control effect of metalaxyl, chlorothalonil, mancozeb + chlorothalonil and thiophanate methyl and chlorothalonil on cucumber blight was good