杀菌剂及其不同配比对辣椒疫霉菌的室内抑制效果

Indoor Inhibitory Effects of Fungicides and Their Different Proportions against Phytophthora capsici

采用生长速率法研究了18种杀菌剂对辣椒疫霉菌(Phytophthora capsici)的室内抑菌效果。研究结果表明:辣椒疫霉病菌对化学药剂表现敏感。其中50%烯酰吗啉WP、250 g/L吡唑嘧菌酯EC、100 g/L氰霜唑SC、20%氟吗啉WP、70%代森锰锌WP、500 g/L氟啶胺SC对辣椒疫霉菌抑菌效果较好,其EC50均<20μg/m L。5种杀菌剂的不同配比中,20%氟吗啉WP∶50%烯酰吗啉WP(1∶5)和500 g/L氟啶胺SC∶100 g/L氰霜唑SC(3∶3)的增效作用最为明显,其共毒系数分别为2 409.84和2 321.76。筛选出了对辣椒疫霉病菌室内抑菌效果较好的药剂,为进一步田间药效试验奠定了基础。

Indoor inhibitory effects of 18 fungicides against Phytophthora capsici were tested by growth rate method. The results show that Phytophthora capsici is sensitive to chemical performance.Dimethomorph 50% WP,Pyraclostrobin 250 g / L EC,Cyazofamid 100 g / L SC,Flumorph 20%WP,Mancozeb 70% WP and Fluazinam 500 g / L SC have higher virulence,and their EC50 is less than 20 μg / m L. In different proportions of the 5 fungicides,20% Flumorph WP ∶ 50% Dimethomorph WP（ 1 ∶ 5） and 500 g / L Fluazinam SC ∶ 100 g / L Cyazofamid SC（ 3 ∶ 3） have most obvious synergistic effect,the co-toxicity coefficients of which are 2 409. 84 and 2 321. 76,respectively. Agents with better indoor antibacterial effects against Phytophthora capsici were screened. The research lays foundation for further field trials.