6种杀菌剂对葡萄霜霉病菌的毒力及药效比较

Comparison on Effect of Six Fungicides on Grape Downy Mildew(Plasmopara viticola) in Laboratory and Field

[目的]筛选防治葡萄霜霉病的有效药剂。[方法]采用叶盘漂浮法测定6种杀菌剂对葡萄霜霉病菌的室内毒力,并对其进行田间药效试验。[结果]6种杀菌剂对葡萄霜霉病菌的EC50在0.3255.256μg/m L;3次施药后7 d平均防效在84.07%93.10%,其中30%吡唑醚菌酯WG、22.5%啶氧菌酯SC和50%氟醚菌酰胺WG的防效超过90%。[结论]6种杀菌剂能较好地防治葡萄霜霉病,30%吡唑醚菌酯WG、22.5%啶氧菌酯SC和50%氟醚菌酰胺WG的防效较高,可在生产上进一步推广使用。

[ Objective ] The study aimed to screen out effective fungicides for control of grape downy mildew. [ Method ] Toxicity of six kinds of fungicides was determined by using leaf disc method and efficacy of the fungicides was tested by field trials. [Result] The EC50 values of the six fungicides to Plasmopara viticola were in the range of 0. 325 - 5. 256 （jig/mL,and the average control efficacy of the fungicides ranged from 84.07% to 93. 10% at the 7th day after the third spraying. The control efficacy of 30% Pyraclostrobin WG,22. 5% picoxystrobin SC,and 50% LH - 2010A WG were all above 90%. [ Conclusion] The six tested fungicides are all effective against the grape downy mildew. 30% pyraclostrob- in WG,22. 5% picoxystrobin SC and 50% LH-2010A WG with high control efficacy,can be further popularized in agricultural production.