Predator mites are tiny mites, typically just barely visible with the naked eye, that live on crop leaves and/or soil where they hunt crop pests.
These crop pests include; thrips, whiteflies, spider mites, and other pest mite species.
By encouraging predator mite populations, you will maintain pest populations at non-damaging levels, decrease the use of pesticides and/or prevent pest populations from entering your growing space in the first place.