The screening results showed that one of the extracts from the insect pathogenic fungus, Gibellula sp. BCC36964 exhibited antibacterial against B. cereus with IC50 value of 12.50 μg/mL, whereas it was inactive at maximum tested concentrations (50 μg/mL) for anti-phytopathogenic activity for C. capsici, C. gloeosporioides, and A. brassicicola.