An organic fertiliser formulated to control basal stem rot (BSR) disease, which is common in oil palm caused by the fungus Ganoderma (Ganoderma boninensis, G. miniatocinctum, and G. zonatum). It is produced using fertiliser technology; and able to control BSR disease at various stages of oil palm growth i.e., at seedling stage in the nursery; during planting or re-planting, pre-mature, and mature. This product can be utilised as organic supplement and as a fertiliser for growth and development of oil palm at the rate specified. This product is easy to handle and more efficient in terms of cost-effectiveness relative to other products. It can reduce BSR disease infection of oil palm and hence, increases oil palm production.