The Influence of Chaetomium cochliodes to the Pathogen of Rose Black Spot

The antagonistic effects of Chaetomium cochliodes , an endophytic fungus from the stem of Rosa rugosa and Marssonina rosae , the pathogen of Rose Black Spot, were studied by confrontation culture, in order to determine whether Chaetomium cochliodes could inhibit the growth of Mars-sonina rosae . The results showed that the diameter of Chaetomium cochliodes and Marssonina ro-sae increased with the culture time, and the diameter of them had significant difference at different culture time (P < 0.01) when they were cultured separately. When they were trained in confrontation, the colony diameter of Chaetomium cochliodes increased with time and had a significant difference at different culture time (P < 0.01), but there was no significant difference of Marssonina rosae . And the inhibitory rate of Chaetomium cochliodes to Marssonina rosae was up to 60.7% and the relative inhibitory rate was 5.38 after 72 hours, which indicated that Chaetomium cochliodes had significant inhibitory effect on Marssonina rosae , it can be used as a potential bio-control agent to control rose black spot. The results provide a basis for screening potential bio-control agents resistant to rose black spot