摘要
为明确聚六亚甲基双胍盐酸盐(Polyhexamethylene biguanidine hydrochloride,PHMB)与氟环唑(epoxiconazole)混配对苹果斑点落叶病菌(Alternaria alternata f.sp.mali)的联合作用类型及最佳配比,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与氟环唑混配对苹果斑点落叶病菌的毒力。结果显示:聚六亚甲基双胍盐酸盐、氟环唑对苹果斑点落叶病菌的EC50分别为30.604、0.621 mg/L,二者以10:1、7:1、4:1、1:1、1:4、1:7、1:10这7个配比混合对苹果斑点落叶病菌的增效系数分别为1.41、1.55、1.59、1.57、1.09、1.12和1.14。氟环唑对苹果斑点落叶病菌的室内生物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以7:1、4:1、1:1这3个配比组合的增效系数均大于1.5,它们对苹果斑点落叶病菌均有增效作用。
The paper aims to clarify the joint effect and optimum ratio of mixed Polyhexamethylene biguanidinehydrochloride(PHMB) and epoxiconazole on Alternaria alternata f. sp. mali. The authors tested the toxicity ofmixed PHMB and epoxiconazole on A. alternata by mycelium growth rate method. The results showed that:EC50 value of PHMB and epoxiconazole on A. alternata was 30.604 and 0.621 mg/L, respectively, when 7 different mixture ratios of PHMB and epoxiconazole were 10:1, 7:1, 4:1, 1:1, 1:4, 1:7 and 1:10, the synergisticcoefficients were 1.41, 1.55, 1.59, 1.57, 1.09, 1.12 and 1.14, respectively; the indoor toxicity of epoxiconazoleon A. alternata was more active than that of PHMB. When the mixture ratios of PHMB and epoxiconazole were 7:1, 4:1 and 1:1, the synergistic coefficients were all greater than 1.5, so the 3 ratios of combination all hadsynergistic effects on A. alternata.
引文
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