50%苯醚甲环唑·硫磺水分散粒剂对西瓜白粉病的田间防治效果

Field Control Efficiency of 50% Difenoconazole-sulfur Water Dispersible Granule on Watermelon Powdery Mildew

以新型药剂50%苯醚甲环唑·硫磺水分散粒剂为试材,采用常规喷雾法,研究了对西瓜白粉病的田间防治效果。结果表明:最有效浓度为每667m2施用50%苯醚甲环唑·硫磺水分散粒剂80g,第2次药后7d对西瓜白粉病的防治效果达70.81%,第4次药后7d的防治效果为83.28%。防效均高于对照药剂250g·L^(-1)苯醚甲环唑乳油和80%硫磺水分散粒剂。生产上可以将50%苯醚甲环唑·硫磺水分散粒剂稀释900~1 200倍使用。

The effect of spraying 50 %difenoconazole-sulfur water dispersible granule against watermelon powdery mildew was studied by spraying method. The results showed the best amount of 50% difenoconazole-sulfur water dispersible granule was 80 g per 667 m^2. Seven days after the second spraying,the control effect reached 70. 81% ,and it reached 83. 28% seven days after the fourth spraying. The control effect were more significant than that of 250 g· L^-1 of difenoeonazole EC and 80% sulfur WG. Therefore, it was suggested to dilute 50% difenoconazole-sulfur water dispersible granule to 900-1 200 times before use.