Basal stem rot (BSR) is a disease that causes decline in oil palm productivity. BSR caused by Ganoderma sp. An alternative environmentally control that can be done is biological control. Bacillus spp. is one alternative way of biological control. This study aims to test the inhibitory ability of Bacillus spp. and get the species of Bacillus spp. that can inhibit Ganoderma sp. and determine the …