6种杀菌剂对牡丹根腐病菌的室内毒力测定

Toxicity Measurement of Six Fungicides against Peony Root Rot Disease

[目的]筛选出牡丹根腐病的有效防治药剂。[方法]在实验室条件下,采用菌丝生长速率法比较分析了6种药剂在10 mg/L质量浓度下对牡丹根腐病的相对抑制率,测定了6种杀菌剂对牡丹根腐病的室内毒力。[结果]在10 mg/L质量浓度下,99%绿亨·恶霉灵可湿性粉剂对牡丹根腐病病原菌的相对抑制率最高,为93.50%;其次是50%多菌灵可湿性粉剂的相对抑制率为89.63%;50%甲锌福美双对牡丹根腐病病原菌的相对抑制率最小,为20.00%。99%绿亨·恶霉灵可湿性粉剂对牡丹根腐病病原菌的毒力最强,EC50为0.002 7mg/L;其次是50%多菌灵可湿性粉剂,EC50为0.019 5 mg/L;复生甲·锌·福美双可湿性粉剂对牡丹根腐病病原菌的毒力最弱,EC50为19.134 6 mg/L。[结论]为牡丹根腐病大田防治的药剂筛选提供了理论依据。

[Objective] The aim was to screen out effective chemicals to control root rot disease. [Method] The relative inhibition rate of six kinds of fungicides at 1 mg,/L against root rot disease were tested by the hypha growth rate in lab, meanwhile their toxicities were also measured. [ Result] Under 1 mg/L, 99% hymexazol had the highest relative inhibition rate （93.50%） against Phyllosticta commonsii; secondly was 50% carbendazim, with the relative inhibition rate of 89.63% ; the relative inhibitory rate of 50% thiram was 20.00%. 99% hymexazol had the best toxicity to peony root rot disease, and its EC50 value only was 0.002 7 mg/L; the followed was 50% carbendazim, and its EC50 value was 0. 019 5 rag/L; the ECso of 50% methyl · zinc · Thiram WP was 19. 134 6 mg/L. [ Conclusion] These results provided the basis for controlling root rot disease in field.