This study examined the difference of competition,hyperparasitism,antibiosis and disease prevention effect of several Trichodermastrains against Fusarium oxysporium f.sp.cucumerinum.The high effective strains were screened for providing theoretical basis for Trichodermacontroling soil borne diseases.The results of confrontation culture experiment showed that the tested Trichoderma strains restrained the spread of F.oxysporum mycelia.Among which,the Trichoderma harzianum TH strain had the strongest competiti...