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[目的]探索苦参碱在甘薯黑斑病防治中的应用。[方法]利用平皿法测定苦参碱与甲基硫菌灵、百菌清和异菌脲3种化学杀菌剂混配对甘薯长喙壳的联合毒力,通过制剂现混处理茎段的方法对增效配比进行防效验证。[结果]苦参碱可有效抑制甘薯长喙壳菌丝生长,EC50值为3.0790 mg/L。苦参碱与甲基硫菌灵混配质量比1∶2、苦参碱与百菌清混配质量比3∶1或1∶1以及苦参碱与异菌脲混配质量比1∶3时表现为增效作用。防效验证结果:苦参碱400 mg/L的防治效果为42.64%,苦参碱与百菌清制剂现混(1∶1)和(3∶1)400 mg/L的防治效果分别为78.25%、70.92%。[结论]苦参碱与百菌清联合使用对甘薯长喙壳的抑制作用优于苦参碱单独使用。
[Objective] The research aimed to explore the application of matrine in the prevention and cure of sweetpotato black spot. [Method] The combined toxicity of matrine and thiophanate methylmethazine, chlorothalonil and iprodione combined with three kinds of chemical fungicides on the long-beaked shell of sweet potato was determined by the plate method. Efficiency ratio proofing. [Result] Matrine could effectively inhibit the growth of mycelia of Myzus persicae. The EC50 value was 3.0790 mg / L. Matrine and thiophanate-methyl mixed mass ratio of 1: 2, matrine and chlorothalonil mixed mass ratio of 3: 1 or 1: 1 and ibuprofen and iprodione mixed mass ratio of 1: 3 When the performance of synergy. The results showed that the control effect of matrine 400 mg / L was 42.64%, the control effects of matrine and chlorothalonil (1: 1) and (3:1) 400 mg / L were 78.25 %, 70.92%. [Conclusion] The combination of matrine and chlorothalonil was superior to matrine alone in the inhibition of the long-beaked shell of sweet potato.