9种杀菌剂对小麦白粉病的田间防治试验

本文比较了9种杀菌剂对小麦白粉病的田间防治效果。结果表明:30%醚菌酯SC 40 m L/667 m2、22.5%啶氧菌酯SC 40m L/667 m2和42.8%氟吡菌酰胺·肟菌酯SC 15 m L/667 m2药后15 d对小麦白粉病的防治效果均较好,同时30%醚菌酯SC40 m L/667 m2和22.5%啶氧菌酯SC 40 m L/667 m2对白粉病的持效期也较长;其次为17.2%吡唑醚菌酯·氟环唑SC 50 m L/667 m2,药后15 d防效也达到88.29%。研究发现生产上常用的20%三唑酮EC 50 m L/667 m2对小麦白粉病的防治效果并不理想,药后15 d防效仅为49.44%,药后30 d下降至34.89%。推荐将30%醚菌酯SC 40 m L/667 m2和22.5%啶氧菌酯SC 40m L/667 m2作为三唑酮的替代药剂或与其他药剂合理轮换使用。

Evaluating the Control Efficacy of Nine Fungicides Against Wheat Powdery Mildew in a Field Experiment

In this research,nine fungicides were evaluated for their control efficacy against wheat powdery mildew in a field experiment. As a result,30%kresoxim-methyl SC (40 mL/667 m2 ),22.5%picoxystrobin SC (40 mL/667 m2 ),and 42.8%fluopyram-triflox-ystrobin SC(15 mL/667 m2)all achieved greater control efficacy against wheat powdery mildew than 17.2%pyraclostrobin-epoxicon-azole SC (50 mL/667 m2 ),whose control efficacy also reached a significant level of 88.29%.Furthermore,30%kresoxim-methyl SC (40 mL/667 m2 )and 22.5% picoxystrobin SC (40 mL/667 m2 )showed longer duration of efficacy than the other tested fungicides. In comparison,20% triazolone EC (50 mL/667 m2 )had substantially lower control efficacy,which stood at 49.44% at 15 day post treatment (dpt)and then fell to 34.89% at 30 dpt.Therefore,we recommend that 30% kresoxim-methyl SC (40 mL/667 m2 )and 22.5% picoxystrobin SC (40 mL/667 m2 )should be used to replace triazolone,or be applied alternately with other fungicides for con-trolling wheat powdery mildew.