6种杀菌剂对烟草后期主要病害防治效果比较

目的]筛选有效防治烟草赤星病和白粉病的药刺。方法]以烟草硒26为供试品种，通过喷雾处理比较6种常用杀菌剂对烤烟后期白粉病、赤星病的防治效果。结果]6种药剂对烟草白粉病和赤星病均有一定的预防和治疗作用。其中以15％三唑酮WP防治白粉病效果最佳，50％退菌特WP对赤星病表现较好的防治效果。白粉病防治在高山烟区还可选用80％的杜邦克露WP，在低山烟区可选用50％退菌特WP；赤星病防治在高山烟区可选用75％百菌清WP，中山烟区可选用15％三唑酮WP。在兴山烟区大田后期选用15％三唑酮WP和50％退菌特WP可综合防治烟草赤星病和白粉病，通过轮换用药，可以提高防治效果。结论]该研究为烟草赤星病和白粉病的有效防治提供了科学依据。

Comparison on the Control Effects of 6 Fungicides on the Main Diseases in Tobacco in Its Late Growth Stage

Objective] The aim was to screen the effective medicaments for controlling tobacco powdery mildew and brown spot.Method] With tobacco K326 as tested variety, the control effect of 6 kinds of common fungicides on powdery mildew and brown spot at flue-cured tobacco later stage were compared by spraying treatment.Result] Six medicaments all had certain preventative and therapeutic effects to tobacco powdery mildew and brown spot.Among them, 15% Triadimefon WP had best control effect on powdery mildew and 50% Tuzet WP had better control effect on brown spot.80% Dupunt curzate WP also could be selected to control powdery mildew in high mountain area and 50% Tuzet WP in low mountain area.75% Chlorothalonil WP could be selected to control brown spot in high mountain area and 15% Triadimefon WP in middle mountain area.The Xingshan tobacco-planting area could select 15% Triadimefon WP and 50% Tuzet WP to control brown spot and powdery mildew in the field at tobacco later stage.Through taking turns to apply medicaments, the control effect could be enhanced.Conclusion] The research provided the scientific basis for controlling tobacco powdery mildew and brown spot effectively.