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This study characterized the antagonistic activities of five fungal endophytes (Aspergillus calidoustous BTF07, Penicillium citrinum BTF08, Trichoderma asperellum T2, Diaporthe phaseolorum WAA02, Diaporthe phaseolorum MIF01) and evaluated their endophyte-host compatibility with the host plant (oil palm). The antifungal activities of the endophytes towards Ganoderma boninense (GB) were first established using the dual culture test, revealing antagonistic nature of endophytes via production of non-volatiles, volatiles and competitive exclusion. Endophyte-host compatibility was then assessed using a simple but rapid endophyte-calli dual-culture assay, and results validated using endophyte-ramet test. Results revealed that endophytes elicited different responses in oil palm calli. BTF08 had growth promoting effects towards the host tissues with the highest calli weight (1013 mg) obtained, while BTF07 …