新型杀菌剂啶氧菌酯对香蕉叶斑病的防治效果

【目的】香蕉叶斑病是香蕉产业的重要病害,化学防治仍然是当前最为有效的防治手段。于2015—2016年连续2年开展香蕉叶斑病的田间化学防治试验,为生产上推广应用新型杀菌剂啶氧菌酯提供依据。【方法】试验设22.5%啶氧菌酯悬浮剂125、150和187.5 mg·kg~(-1),对照药剂250 g·L-1吡唑醚菌酯乳油125 mg·kg~(-1),以及空白对照共5个处理,3次药后第12或13天调查正常叶数、病叶数及病级,计算平均病指及平均防效。【结果】22.5%啶氧菌酯悬浮剂(有效成分用量125、150和187.5 mg·kg~(-1))2015年的防治效果分别为64.70%、68.16%和71.29%,2016年防治效果分别为68.44%、72.36%和76.29%。此外,在试验期间香蕉嫩叶未见药害现象,叶片生长均正常。【结论】22.5%啶氧菌酯悬浮剂是防治香蕉叶斑病的优良药剂,对香蕉比较安全,值得在香蕉产区推广应用。

The effectiveness of a new fungicide, picoxystrobin against the banana sigatoka disease

Aim] The banana sigatoka disease is an important disease threatening banana production. Currently, chemical control is the most effective method. In order to assist appropriate application rates, chemical control experiment of banana sigatoka disease was carried out in the field in 2015-2016.Method] Five treatments were designed including 3 concentrations of 22.5% picoxystrobin SC (125 mg·kg^-1, 150 mg·kg^-1 and 187.5 mg·kg^-1), 250 g·L^-1 pyraclostrobin EC (125 mg·kg^-1) and the blank control (sprayed 3 times). We evaluated the responses by counting the normal vs. diseased leaves, disease severiaty after 12-13 days, and calculating the average disease index and control effect.Result] The control effect of 22.5% picoxystrobin SC (125 mg·kg^-1, 150 mg·kg^-1 and 187.5 mg·kg^-1) on the banana sigatoka disease was 64.70%, 68.16% and 71.29%, respectively, in 2015 and 68.44%, 72.36% and 76.29%, respectively, in 2016. In addition, during the experiment period, no damage was observed in the young leaves of the banana, and the leaf growth was normal.Conclusion] 22.5% picoxystrobin SC is an excellent fungicide for controlling banana sigatoka disease, and it is safe to banana, so it can be popularized in banana production.