To determine the antibiotic activity of extracts against B. subtilis and E. carotovora subsp. carotovora, the disc diffusion method was used. Ten μl of redissolved ethyl acetate extracts of Gliocladium sp. T.N.C73 fermentation medium in MeOH were applied to sterile 6-mm antibiotic blank disc and left to dry at room temperature (30oC), before transferring to a 9-cm diameter bacterial inoculated agar plates (B. subtilis or E. carotovora subsp. carotovora). The cultures were incubated at 37oC for one day, and the inhibition zones, including the paper discs, were measured (mm). The assays were performed in duplicates. As positive controls, ten μl of a 3 μg/μl Amoxicillin (Amoxsan®, P.T. Sanbe Farma, Bandung, Indonesia) in MeOH were used. As negative controls 10 μl of the solvent MeOH were used.