BSR (Basal Stem Rot) disease can cause the productive lifespan of oil palm plants to be shorter than the typical productive lifespan of oil palms. Ganoderma boninese is a soil-borne pathogenic fungus that can infect oil palm plants through their roots and spread the disease by producing basidiospores. Based on the background above, the problem formulation of this research is how the rhizome exu…