6种杀菌剂对葡萄霜霉病菌的毒力及药效比较

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。

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

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 μg/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％ pyraclostrobin WG,22.5％ picoxystrobin SC and 50％ LH-2010A WG with high control efficacy,can be further popularized in agricultural production.