Screening and Evaluation of Antagonistic Microbes against Phytophthora capsici

Totally 382 bacteria and 264 actinomycetes were isolated from 67 different soil samples, and hot pepper antago- nist strains of Phytophthora were selected through paired culture, in which the ratio of actinomycetes was higher (44.1%) than that of bacteria (8.5%). Twenty-six strains with strong antibacterial activity against 6 kinds of plant pathogenic fungi and pot control effects were determined. The results showed that all of the antagonists B-YD4-6, A-NP6-7 and A-GD5-2 had antimicrobial ability to the 6 plant pathogenic fungi, with an inhibitory diameter of 22.0-26.0 mm and inhibitory rate of 45.18%-55.56%. The effects of the 3 better antagonists on Phytophthora capsici were 65.5%, 67.4% and 64.5%, respectively.