Abstract: Background and Objective: There are considerable variability among smallholders pertaining to their level of knowledge on oil palm management especially concerning pests and diseases. One of the important disease threatening oil palm areas are Basal Stem Rot (BSR), a disease that is commonly associated with fungus of the Ganoderma species. This study aimed to determine the level of knowledge regarding BSR disease of oil palm and its control practices among recipients of replanting assistance scheme (TSSPK) in Selangor, Negeri Sembilan and Perak and to identify the relationship between respondent’s backgrounds with their level of knowledge. Methodology: A total of 310 respondents were selected based on proportionate and simple random sampling. Interview administrated questionnaires were employed to obtain the relevant data. Results: The study revealed majority of the respondents had low level of knowledge regarding BSR disease. Few variables have been found to have significant relationship with the level of knowledge on BSR among the respondents. Results highlighted the level of knowledge on BSR disease and its control practices among oil palm smallholders. Conclusion: This study proposed the way to determine the level of knowledge among small farmers. Larger sample would provide a general guideline in plan training and courses according to knowledge level of smallholders.