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Trichoderma spp.has capacities in inhibiting or killing many soil borne pathogenic fungi, which make it one of promising biocontrol agent.Ganoderma pseudoferreum and Phellinus noxius Corner are two major pathogens of Hevea brasiliensis root disease, which seriously threaten rubber tree planting.In our study, the antagonistic effects of Trichoderma on these two pathogens were tested in vitro by duel culture.The results showed that many Trichoderma strains, including the native strains Hb1-3 and Hb5-3 screened by ourselves from tropical rubber tree plantation, dramatically inhibited the growth of pathogens.