打瓜白粉病药剂防治技术研究

Study on the Technique of Controling Seed-used Watermelon Powdery Mildew with Bactericides

【目的】针对打瓜白粉病在新疆严重危害的现状,研究6种杀菌剂对打瓜白粉病的田间防治效果。【方法】采用田间小区试验,比较6种药剂的防效差异。【结果】两次施药后第14 d,10%苯醚菌酯悬浮剂5000倍液防效最高,防效达73.80%。10%苯醚菌酯悬浮剂10 000倍液、50%醚菌酯水分散粒剂3 000倍液、400 g/L氟硅唑乳油7 500倍液和25%乙嘧酚悬浮剂1 500倍液的防效也较好,药后14 d分别达69.69%、69.56%、68.48%和67.32%。【结论】4种药剂防效较好,推荐在生产中交替使用。提出了打瓜白粉病防治原则,明确了该病的初侵染来源和防治始期。防治打瓜白粉病的关键是抓住发病始期,选用高效杀菌剂及时喷药。

[ Objective ] Because seed- used watermelon powdery mildew induced serious damage in Xinjiang Region, we study the control efficacy of six bactericides to seed - used watermelon powdery mildew in the field. [ Method ] Comparison of the control efficacy of six bactericides to seed - used watermelon powdery mildew was made in the field plot experiment. [ Result] Fourteen days after using these bactericides twice, thecontrol efficacy of 10% ZJ0712 wp 5,000 times solution is 73.80%, achieving the highest control efficacy in all the six used bactericides And the control efficacy of 10% ZJ0712 wp 1,0000 times solution, 50% Kresoxim - methyl WG 3,000 times solution, 400 g/L Flusilazole EC 7,500 times solution and 25% Ethirimol wp 1,500 times solution are also effective, reaching the effect of 69.69% , 69.56% , 68.48%, and 67.32% respectively after being used 14 days later. [ Conclusion] The control efficacy of ZJ0712 wp, 50% Kresoxim - methyl WG, 400 g/L Flusilazole EC and 25% Ethirimol wp are quite effective, so it is suggested that they could be used in production by turn, and the rule for controlling seed - used watermelon powdery mildew is made. The primary sources of infection and suitable time for controlling this disease have been clearly made, too. The key to controlling seed- used watermelon powdery mildew is to spray effective bactericide in time. Key words, seed - used watermelon; powdery mildew; control technique