The fungal collections, Trichoderma asperellum LBKURCC1, Trichoderma asperelloides LBKURCC2 and Penicillium sp. LBKURCC34 are fungi isolated from plantation soil and peat soil in Riau Province. These fungi have the potential to produce secondary metabolites that have antimicrobial activity. This study aims to examine the antagonistic activity between local isolates of Riau fungi; LBKURCC1, LBKU…