Abstract: A study on the biocontrol efficacy of the actinomyces strains Ⅲ-61 and A-21 against fusarium wilt and gray mold of vegetables was launched for the sake of evaluating the application significance of the two strains for the biological control of plant diseases,and providing scientific basis for the follow up research on their development.In which,the antifungal bands of 17.5-20.9 mm wide produced by living colonies of the two strains against ones of Fusarium oxysporum f.sp.cucumerinum and Botrytis cinerea were obtained by using the method of culturing colonies confronting each other on plate.The suppressing rates of 76.5%-100% to the growth of pathogen mycelia with the method of growth rate,the inhibiting rate of 100% to the conidial germination of pathogens with the method of germinating on concave sheet glasses were presented by their germfree ferment filtrate diluted by 5 times,and the distorting rate of 100% to germ tubes of the conidia by the filtrate diluted by 100 times were also observed.The fungilytic action to Hyphae of the pathogens on plates was presented by the two strains too.In greenhouse potting trial with the ferment solutions diluted by 4 times,the relative control efficiencies to cucumber fusarium wilt were 60.61%-65.15%,to gray molds of tomato and pepper were up to 62.49%-89.76%.The result showed that the two strains are excellent biocontrol materials with good prospects of development and application.

Key words: Antagonistic actinomyces, Fusarium oxysporum, f.sp.cucumerinum, Botrytis cinerea, Biological control

CLC Number: 

• Q939.13