Most nematodes are beneficial and "graze" on black vine weevil, currant borer moth, fungus gnats, other weevils, scarabs, cutworms, webworms, billbugs, mole crickets, termites, peach tree borer and carpenter worm moths.

They also predate bacteria, recycling nutrients back into the soil and by doing so stimulates bacterial activity. They act as microbial taxis by transporting microbes to new locations of soil as they move through it while providing aeration.