Antagonistic activity of Trichoderma sp. against five pathogenic fungi viz., Fusarium incarnatum, Alternaria citri, Colletotrichum musae, Colletotrichum sp. and Gibberella avenacea was assessed by dual culture plate method (Fig.1). On an average the radius of pathogenic fungi in control plates (i.e. when those were grown alone) was 38.2 mm. It was highest ( 70 mm ) for Colletotrichum sp. while least for the pathogen Alternaria citri (23 mm) however, the radius of almost all fungi under investigation reduced within the range of 12 to 17 mm with an average value of 14 mm in dual culture. Among the fungi maximum percent inhibition was observed against Colletotrichum sp. (80%) followed by Colletotrichum musae (61.29%), Fusarium incarnatum (56.67%), Gibberella avenacea (54.05%) and Alternaria citri (39.13%) with decreasing orders. This indicated strong antagonistic activity exhibited by Trichoderma sp. against the pathogenic fungi. There was significant difference between the radius of colonies by fungi when grown alone and those with Trichoderma sp. (Table 1, Fig.1).