几种杀菌剂防治黄瓜霜霉病作用特性研究

Study on Characteristics of Fungicides Against Cucumber Downy Mildew

采用盆栽法比较了不同药剂对黄瓜霜霉病的作用特性。结果表明：20％氟吗啉可湿性粉剂、687．5g／L氟菌·霜霉威悬浮剂、50％烯酰吗啉可湿性粉剂、25％氟吗·唑菌酯悬浮剂、72％霜脲·锰锌可湿性粉剂等对黄瓜霜霉病均有良好的保护活性；当有效成分用量一定时，喷液量充足才能保证药效发挥。20％氟吗啉可湿性粉剂、25％氟吗·唑菌酯悬浮剂、50％烯酰吗啉可湿性粉剂、687．5g／L氟菌·霜霉威悬浮剂均有很好的1～3d治疗活性，药后5d的治疗效果明显下降。

The characteristics of several fungicides against cucumber downy mildew were compared, and the application technology was studied by pot planting method. The results showed that flumorph 20% WP, fluopicolide ＋ propamocarb hydrochloride 687.5 g/L SC, dimethomorph 50% WP, flumorph ＋ pyraoxystrobin 25% SC, cymoxanil ＋ mancozeb 72% WP afforded good protective activities. Enough spraying volume would ensure the activities of these fungicides with the same active ingredient mass. These fungicides showed good curative activities （1-3 d） except cymoxanil ＋ mancozeb 72% WP. On the 5th day after spraying, the curative activities declined obviously.