湖南省露地黄瓜霜霉病菌对七种杀菌剂的敏感度研究

为筛选高效防控露地栽培黄瓜的黄瓜霜霉病防控药剂,采用叶盘漂浮法测定了黄瓜霜霉病菌对7种杀菌剂的敏感度,并以茎叶喷雾法评估了这7种杀菌剂对露地黄瓜上黄瓜霜霉病的田间防效。结果表明,湖南省不同地区采集的黄瓜霜霉病菌对7种杀菌剂的敏感度具有明显差异,其中对双炔酰菌胺的敏感度最高,EC₅₀值为0.41±0.053 mg/L;对霜霉威的敏感度最低,EC₅₀值为28.62±0.78 mg/L。7种杀菌剂的推荐剂量对露地栽培黄瓜的黄瓜霜霉病均具有较好的防控效果,在湖南露地栽培的黄瓜,可轮换使用敏感度高的杀菌剂氟吡菌胺、氟啶胺、氟硅唑和双炔酰菌胺。

Sensitivity of Pseudoperonospora cubensis in Open Field Cucumber in Hunan Province to Seven Fungicides

The sensitivity of Pseudoperonospora cubensis in open field cucumber in Hunan province to seven fungicides were determined by leaf disc floating method,and control effect of cucumber downy mildew in open field cucumber by seven fungicides was also assayed using the method of spraying stems and leaves.The results showed the sensitivity of Pseudoperonospora cubensis from three regions of Hunan province to seven fungicides were different.The sensitivity of Pseudoperonospora cubensis was highest to mandipropamid(EC₅₀=0.41±0.053 mg/L),and lowest to propamocarb(EC₅₀=28.62±0.78 mg/L).The 7 fungicides with recommended dose could effectively control cucumber downy mildew in open field cucumber,and the high sensitivity fungicides including fluopicolide,fluazinam,flusilazole and mandipropamid were alternatively selected to control cucumber downy mildew in open field cucumber.