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[目的]通过室内试验,验证D-松醇原药及其水剂对黄瓜白粉病的作用方式,为D-松醇的田间应用提供理论支持。[方法]配制不同质量浓度的D-松醇原药及其水剂,在不同时间采用温室喷雾法对黄瓜白粉病进行防治试验,调查其防治效果。[结果]试验表明:接种后第3天,原药和水剂分别处理的防效均优于各接种前5、2 d和接种后1 d处理的效果。原药质量浓度梯度实验显示2000 mg/L时,接菌后7 d防效达64.52%,其他处理方式的防效均低于50%。20%(质量分数)水剂稀释至3.3%,接菌后7 d,防效为93.07%,同比防效最好。[结论]研究表明:D-松醇对黄瓜白粉病有治疗效果,治疗3 d的防效效果最好。原药2000 mg/L时防效最好,20%的水剂稀释至3.3%防效最好。水剂在减少D-松醇原药用量的基础上,进一步减轻了黄瓜白粉病发病程度,为D-松醇水剂的开发提供了可行性依据。此外,D-松醇原药及其水剂对黄瓜白粉病作用方式的确定为深入研究D-松醇对黄瓜白粉病菌的作用机制提供了依据。
[Objective] The objective of the experiment was to verify the mode of action of D-pinitol and its liquid agent on cucumber powdery mildew by laboratory experiments, and provide theoretical support for the field application of D-pinitol. [Method] D-pinitol and its aqueous solution with different mass concentration were prepared. The greenhouse spraying method was used to control the cucumber powdery mildew at different time and its control effect was investigated. [Result] The experiment showed that on the 3rd day after inoculation, the control effect of the original drug and the aqueous agent were better than that before 5 and 2 days and 1 day after inoculation. The original mass concentration gradient experiment showed that the anti-efficacy was 64.52% on the 7th day after inoculation at 2000 mg / L, and the other treatments were less than 50%. 20% (mass fraction) aqueous solution was diluted to 3.3%, 7 days after inoculation, the control effect was 93.07%, the best year-on-year. [Conclusion] The results showed that D-pinitol had the curative effect on cucumber powdery mildew and the best effect was achieved on the 3rd day. When the original drug is 2000 mg / L, the control effect is the best, while the 20% water solution is diluted to 3.3% and the control effect is the best. On the basis of reducing the dosage of D-pinitol, the agent can further reduce the incidence of cucumber powdery mildew and provide a feasible basis for the development of D-pinitol. In addition, the D-pinitol and its aqueous solution of cucumber powdery mildew is determined in order to further study the mechanism of D-pinitol on powdery mildew pathogenic bacteria provide the basis.