青稞根腐病在藏区发生日趋频繁、严重，不仅导致青稞大量减产，且对其品质影响颇大。为筛出安全高效的藏区青稞根腐病防治药剂，以藏青2000为指示品种，选取11种常用根腐病防治药剂对其种子拌种或浸种处理进行田间防效试验，田间调查各处理物候期、成株根腐病发病率、防效、农艺性状和折合产量，并基于青稞根腐病发病率、千粒重与折合产量进行Topsis综合评价。结果发现，采用31.9%戊唑·吡虫啉悬浮种衣剂拌种处理(4.8 mL加水200 mL拌种1.6 kg，堆闷24 h)后播种，综合评价最优(Topsis统计量最大，为0.872 726)，且植株综合农艺性状优良，根腐病发病率仅4.23%，防效达39.10%，青稞折合产量为2 165 kg/hm2，可考虑在藏区青稞生产中田间防治青稞根腐病时推广使用。

Naked barley root rot occurs much more frequently and seriously in Tibetan areas, leading to the heavy reduction of naked barley yield and quality. To screen out safe and efficient pesticides to control naked barley root rot, naked barly variety Zangqing 2000 was used, and 11 pesticides were selected for seed dressing or soaking treatment to conduct field contrl effect experiemt, and phenology, root rot incidence in the adult stage, control efficiency, agronomic traits and average yield were investigated. Eventually, Topsis comprehensive evaluation was conducted based on the incidence of root rot, 1000-grain weight and average yield. The results showed that the optimal treatment through comprehensive evaluation(with the largest Topsis statistic of 0.872 726) was 31.9% tezontle imidacloprid suspended seed coating agent(4.8 mL with 200 mL water to mix 1.6 kg of seeds for 24 h). The comprehensive agronomic characteristics of naked barley were excellent, the incidence of root rot was only 4.23%, and the control efficiency reached 39.10%. In addition, average yield was up to 2 165 kg/ha in this treatment. This pesticide along with the above treatment method could be popularized in the field prevention of naked barley root rot.

S512.3

甘肃省科技计划(20YF3NA021)；甘肃省重大科技专项(182D2NA008)；国家现代农业产业技术体系专项资金(CARS-05)。