Antimicrobial activity and virulence of  actinomycetes metabolites against vegetable soil borne pathogenic fungi

By means of plate confrontation culture and mycelium growth rate， the antimicrobial activity and virulence of metabolities of soil actinomycetes against vetetable soil borne pathogenic fungi were tested . The results showed that 483 actinomycete strains were isolated from 122 soil samples of protected vegetable， many other crop roots and different vegetatation from more than 10 cities and counties in Ningxia， and further purified， observed and determined 212 strains of actinomycetes with faster growth rate and we well growth. Through determination of the antagonism， antibacterial activity and virulence， 3 strains of biocontrol actinomyces which had significant inhibitory effect on many pathogenic fungi of vegetable soil borne diseases were screened out in order to provide good source of actinomycete strains for the development of biological pesticide.