Abstract: The resistances of 19 pepper materials planted in Hainan to pepper blight were identified by means of root irrigating method. The inhibition effect of six fungicides on Phytophthora capsici was evaluated by mycelium growth inhibition method. And the effects of 6 fungicides on pot culture were compared. The results showed that there were great differences in disease resistance of the tested pepper varieties, among which 17 kinds of susceptible materials were screened out; One medium resistance species was screened out, which was Lafeng new No. 3; One high resistance species was screened out, which was Hot No. 4 green string pepper. The inhibition effect of different agents on the mycelia of Phytophthora capsici was significantly different. Among them, 50% dimorpholine wetable powder had the best inhibition effect on the mycelia, with EC₅₀ of 0.575 0 μg/mL. The second was 68% metalaxyl·manganese zinc water dispersible granule, EC₅₀ was 2.202 9 μg/mL. The best control effect was 68% metalaxyl·manganese zinc water dispersible granule 400 times diluted for root irrigation on pepper blight pot, up to 65.68%. Combined with indoor toxicity test and pot control experiment, 68% metalaxyl·manganese zinc water dispersible granule can be used to control pepper blight.

Key words: pepper blight, resistance screening, control fungicide