洋葱茎基盘腐烂病药剂田间筛选试验

Field screening test of fungicides against onion basal rot disease

为了解决甘肃河西地区洋葱茎基盘腐烂病发病重、药剂防效差的问题,本试验选取7种药剂,在移栽时进行蘸根处理,观测分析不同药剂处理对洋葱植株成活率、生育期、防治效果和产量的影响。结果表明,1%申嗪霉素悬浮剂500倍液蘸根处理对洋葱茎基盘腐烂病防治效果较好,植株成活率达到90%以上,定植后30 d的防治效果为80.89%,57 d的防治效果为64.45%,产量为7029.85 kg/667 m^(2),增产率达到26.77%。在洋葱定植时可以使用该药剂进行蘸根处理,57 d内对茎基盘腐烂病的防治效果较好,且减少了农药的施用量,为甘肃河西高海拔冷凉区洋葱绿色优质生产提供了技术方法。

In order to solve the problem of serious disease and poor control effect on onion basal rot disease,seven kinds of fungicides were selected in this experiment.The effects of different fungicides on the survival rate,growth period,control effect and yield of onion plants were observed and analyzed.The results showed that the control effect of 1% shenqinmycin 500 times solution dipped in root was better,and the survival rate of plant was over 90%.The control efficacy was 80.89% 30 days after planting.The control efficacy was 64.45% 57 days after planting,the yield was 7029.85 kg/667 m^(2),and yield increase rate was 26.77%.When planting onion,1% shenqinmycin SC can be applied by root dipping.Within 57 days,the control effect was better against rot disease,meanwhile,the fungicide application amount of pesticide was reduced,which provides a technical method for green and high-quality production of onion in high altitude cold and cool area of Hexi,Gansu province.