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白粉病是烟草的重要真菌病害之一,为了筛选有效的防治药剂,选择5种杀菌剂进行了药效试验。采用载玻片捕获孢子的方法测定接种温室内的粉孢子浓度,让烟株自然发病,尔后喷洒供试杀菌剂。计算病情指数和防效,并进行差异显著性分析。5种杀菌剂防效以25%丙环唑EC最佳,达91.89%,其他药剂防效由高到低依次为40%氟硅唑EC、12.5%腈菌唑EC和0.5%几丁聚糖SL,这3种杀菌剂均优于对照药剂20%三唑酮DP。
Powdery mildew is one of the important fungal diseases of tobacco. In order to screen effective control agents, five kinds of fungicides were selected for efficacy test. Slides were used to capture the spores of the spores inoculated with the determination of the concentration of powder spores, so that the natural onset of tobacco plants, and then spraying the test fungicide. Calculate the disease index and control effect, and make significant difference analysis. The five fungicides showed the best 25% propiconazole EC (91.89%), the other pesticides were 40% flusilazole EC, 12.5% myclobutanil EC and 0.5% chitosan SL, these three kinds of fungicides are better than the control agent 20% triadimefon DP.