摘要
本研究采用菌丝生长速率法测定了聚六亚甲基双胍盐酸盐(polyhexamethylene biguanidine hydrochloride)与氟环唑(epoxiconazole)混配对水稻稻曲病菌(Ustilaginoidea virens)的毒力,旨在明确二者混配对水稻稻曲病菌的联合作用类型及最佳配比。结果表明,聚六亚甲基双胍盐酸盐、氟环唑对水稻稻曲病菌的EC_(50)分别为44.111、1.743 mg·L~(-1),氟环唑对水稻稻曲病菌的室内毒力活性明显高于聚六亚甲基双胍盐酸盐。聚六亚甲基双胍盐酸盐与氟环唑25:1配比表现为相加作用;5:1、10:1、15:1和20:1四个配比表现为增效作用,其中,配比为10:1和15:1的SR分别为1.64和1.66,增效作用明显。
This study was conducted to clarify the co-effects of mixed polyhexamethylene biguanidine hydrochloride( PHMB) and epoxiconazole on Ustilaginoidea virens,and to find out their best mixed ratio by mycelium growth rate method. The results showed that the EC_(50) of PHMB and epoxiconazole to U. virens were 44. 111 and 1. 743 mg·L~(-1),respectively,which indicated that the indoor toxicity of epoxiconazole to U. virens was more active compared with PHMB. In the 5 different mixing ratios of PHMB and epoxiconazole,the ratio of 25:1 could do additively,and the ratio of 5:1,10 :1,15 :1 and 20 :1 had synergistic effect on U. virens; among which,the ratio of 10:1 and 15:1 showed the strongest synergistic effect with the synergistic coefficients as 1. 64 and 1. 66,respectively.
引文
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