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

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.