筛选对火龙果溃疡病具有较好防治效果的复配药剂，为火龙果溃疡病的科学防治提供依据。采用菌丝速率生长法测定5种新型复配药剂对火龙果溃疡病菌的抑制效果，并开展田间化学防治火龙果溃疡病试验。室内毒力测定试验结果表明，400 g/L氟菌·戊唑醇悬浮剂、325 g/L苯甲·嘧菌酯悬浮剂和75%肟菌·戊唑醇水分散粒剂对火龙果溃疡病菌具有较强的抑制效果，当药剂浓度为10 μg/mL，3个复配药剂对病原菌的抑制效果为92.57%~97.21%。田间药效试验结果表明，上述3种药剂对田间火龙果溃疡病具有较好的防治效果，3次药后12 d的平均防治效果为71.12%~77.45%。400 g/L氟菌·戊唑醇悬浮剂、325 g/L苯甲·嘧菌酯悬浮剂和75%肟菌·戊唑醇水分散粒剂对火龙果安全、高效，值得应用于火龙果溃疡病防治的示范与推广工作中。

The compound fungicides with better control effect on pitaya canker were screened to provide the basis for scientific prevention and control of the disease. The inhibitory effect of five new compound agents on pitaya canker was determined by the mycelial rate growth method, and the field control effect test was carried out. The results of indoor toxicity test showed that fluorobacteria·tebuconazole 400 g/L SC, benzodiazepine·azoxystrobin 325 g/L SC and trifloxystrobin·tebuconazole 75% WDS had strong inhibition on Neoscytalidium dimidiatum. When the concentration of the medicine was 10 μg/mL, the inhibitory effect of the three fungicides on pathogenic bacteria ranged from 92.57% to 97.21%. The results of the field efficacy test showed that the above three fungicides had good control effects on pitaya canker in the field, and the average control effect was between 71.12%-77.45% after 12 days of three treatments. The three fungicides of fluorobacteria·tebuconazole 400 g/L SC, benzodiazepine·azoxystrobin 325 g/L SC and trifloxystrobin·tebuconazole 75% WDS are safe and efficient for pitaya, and are worthy of application in the prevention and treatment of pitaya canker.