Obstacles in oil palm cultivation include the attack of horned beetle Oryctes rhinoceros. This study aims to determine the effectiveness of Bacillus thuringiensis bio-insecticide based on tapioca dregs and oil palm cake on the mortality of O. rhinoceros larvae. This research was carried out in the green house using the Randomized Complate Block Design (RCBD) method. The study consisted of 6 tre…