6种杀菌剂对芦笋茎枯病的防治效果

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。

Control effects of six fungicides on asparagus stem blight disease

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 between 64.30% 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% and 23.66% when the dosage of effective constituents were 300 g/hm2, 400 g/hm2 and 500 g/hm2, 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/hm2, 400 g/hm2 and 500 g/hm2, 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%.