Introduction: Mangrove fruit (Sonneratia caseolaris L) from Sonneratiaceae family known with local name “Pidada Merah” has bioactive components. The present study aimed to evaluate the antimicrobial activity of this plant. Method: The sample was macerated using methanol, the antimicrobial activity assay was performed using agar disc diffusion method against Escherichia coli ATTC9637, Staphylococcus aureus ATTC6538, and Candida albicans ATTC10231. Results: Antimicrobial activity of Mangrove fruit methanol extract were obtained the optimum concentration of S. aureus of 80%, E. coli of 15%, and C. albicans of 30%. Conclusion: based on the results, the sample has antimicrobial properties, and this is a preliminary data for further study.
Key words: Sonneratia caseolaris L, Mangrove fruit, Antimicrobial activity, Agar disc diffusion method.