IMO = Indegenous Micro organism
IMO are harvested in rich biodiversity ecosystem like forest or natural grassland to increase the diversity of microorganism in your soil. It improves your soil life and as it create a greater competition between the soil food web it allow to decrease the impact of the parasite and the unwanted microorganism. It will only work if you create for them a good habitat with moisture, no direct sun ray exposure, and enough food for them to decompose and feed on. You can add it to your
compost pile or your compost tea. As I am not an expert please excuse me if I forgotten something.