6种杀菌剂对芦笋茎枯病的防治效果

Control effects of six fungicides on asparagus stem blight disease

芦笋茎枯病是芦笋生产上的毁灭性病害,近年来其发生程度有加重的趋势。为有效地防治该病,对6种杀菌剂进行了田间药效试验。结果表明:25%吡唑醚菌酯乳油的防效最好,对芦笋茎枯病防效为64.30%~74.85%;30%苯醚甲环唑乳油和20%嘧菌酯水分散粒剂次之,其防效分别为61.90%~72.66%和61.12~71.25%;30%醚菌酯悬浮剂的防治效果相对较好,防效为57.07%~67.37%。70%甲基硫菌灵可湿性粉剂和50%多菌灵可湿性粉剂的防效较差,其防效分别为24.48%~34.99%和22.37%~29.85%。25%吡唑醚菌酯乳油的增产率最高,有效成分用量300、400、500g/hm2的增产率分别为19.84%、22.08%、23.66%。30%苯醚甲环唑乳油次之,有效成分用量300、400、500g/hm2的增产率分别为19.32%、20.77%、22.14%。20%嘧菌酯水分散粒剂和30%醚菌酯悬浮剂的增产率相对较高,为15%~20%。对照药剂70%甲基硫菌灵可湿性粉剂和50%多菌灵可湿性粉剂的增产率均在10%左右。

Asparagus stem blight is a worldwide devastating disease.To control this disease effectively,6 fungicides,including pyraclostrobin 25% EC,difenoconazole 30% EC,azoxystrobin 20% WG,kresoxim-methyl 30%SC,thiophanate-methyl 70% WP and carbendazim 50% WP,were chosen to determine their control effects in the fields.The results revealed the effect of pyraclostrobin 25% EC was the best,with the efficacy between64.30%and 74.85%,followed by difenoconazole 30% EC and azoxystrobin 20% WG,with the efficacies of 61.90%-72.66% and 61.12%-71.25%,respectively.The effect of kresoxim-methyl 30% SC was relatively better,with the efficacy between 57.07% and 67.37%.The control effects of thiophanate-methyl 70% WP and 50% carbendazim WP were the weakest,with the efficacies of 24.48%-34.99% and 22.37%-29.85%,respectively.The production-increasing rate of pyraclostrobin 25% EC was the highest,with the rates of 19.84%,22.08% and23.66% when the dosage of effective constituents were 300 g/hm^2,400 g/hm^2 and500 g/hm^2,respectively.The production-increasing rate of difenoconazole 30% EC took the second place,with the rates of 19.32%,20.77%and 22.14% when the dosage of effective constituents were 300 g/hm^2,400 g/hm^2 and 500 g/hm^2,respectively.The production-increasing rates of azoxystrobin 20% WG,kresoxim-methyl 30% SC were relatively higher,with a rate between 15% and 20%,while those of thiophanate-methyl 70% WP and carbendazim 50% WP were lower,with the rates around 10%.