为筛选安全高效、经济适用的青稞根腐病防治药剂，选取12种常用低毒药剂，对青稞品种藏青2000采用拌种或浸种处理进行田间防治试验，结合不同处理物候期、倒伏率、发病率、农艺性状及产量等指标，并基于千粒重、产量及根腐病发生率进行Topsis综合评价。结果表明，不同药剂处理均能有效降低根腐病发生率，其中用50%克菌丹可湿性粉剂2.40 kg/hm2拌种处理综合评价最优，施用后青稞未发生倒伏，根腐病发生率为5.00%，适宜于根腐病发病严重区域推广使用。1亿活芽孢/g的枯草芽孢杆菌微囊粒剂和50%吲唑磺菌胺水分散粒剂拌种处理的青稞根腐病发病率均为6.67%，折合产量分别5 900、5 190 kg/hm2。其中枯草芽孢杆菌微囊粒剂拌种处理的增产率最高，为8.19%，更适宜于大面积推广。

For screening safe， efficient and economic fungicides， we selected 12 kinds of low toxic fungicides to treat Zang-Qing 2000 with seed dressing or seed handling， and combined different treatment， the phenological period， lodging rate， incidence rate， main agronomic characteristic， yieldto conduct Topsis comprehensive evaluation， which based on 1 000-grain weight， yield and incidence of root rot， aiming to research all the fungicides’ control effect. The results illustrated that all treatments could effectively reduce the incidence of root rot and the main agronomic traits were good， otherwise， the growth of naked barley was safe. Among them， the comprehensive evaluation of 50% gramme mycorrhizin wetable powder at the rate of 160 g per mu was the best. After application， no lodging occurred in naked barley and the incidence of root rot was 5.00%， which was suitable for promotion and use in areas with serious incidence of root rot. 100 million live spores/g Bacillus subtilis microcapsule fungicide and 50% indazolamide water dispersive fungicide treatment of barley root rot incidence were both 6.67%. On the other hand， the per mu yield of the two is respectively 393.58 kg、 346.24 kg， among which Bacillus subtilis microcapsule agent had the highest yield with 8.19%， more suitable for large-scale promotion of planting.

S512.3

国家现代农业产业技术体系专项资金(CARS-05)；甘肃省科技计划资助(20YF3NA021)；甘肃省小杂粮新品种选育与示范(182D2NA008)。