（Vegetable Genetic Improvement，Ministry of Agriculture Key Laboratory，Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences， Beijing 100081，China）
Abstract：This paper had screened the bio-control resources of 18 Trichoderma species，including 175 strains，against 3 kinds of soil-born vegetable pathogens as Fusarium oxysporum f. sp. cucumebrium Owen，Phytophthora capsici and Ralstonia solanacearum through confront culture experiments and green house potted plant experiments. The results indicated that through confront culture experiments，we have screened out 50 Trichoderma strains with inhibitation rate as 70.0%-86.3% against Fusarium oxysporum f. sp.cucumebrium Owen，and 43 Trichoderma strains with inhibitation rate as 70.4%-88.7% against Phytophthora capsici．And the potted plant experiments have screened out 32 Trichoderma strains with bio-control efficacy of 50.0%-92.7% against Ralstonia solanacearum．We further assessed the bio-control efficacy of 13 Trichoderma strains with antagonistic inhibitation rate higher than75% by potted plant experiment，and found 2 Trichoderma strains T52（Trichoderma atroviride） and 32080（Trichoderma pleurotum） with high bio-control efficacy over 60%．
