There are studies which indicate that Trichoderma strains including h. & k. can inhibit and consume endomycorrhizal fungi when included in spore form in a product, especially if the spores are freeze processed and (IMO) if the Trich spores greatly outnumber the endo spores as they usually do. To be fair there are studies and opinions counter to this. So Bill is right....ask the endomycorrhizal fungi. Jim: I had a source of pure Trich spores but lost it and am looking for a new source. Email me. Smallaxe; If you grow Trich h. 22 (or some other Trichs) out with water and molasses beforehand it is effective for battling pathogens on leaf surfaces.