Root-feeding fungus gnats can be especially damaging to plant seedlings, inhibiting growth and transmitting disease. The fungus gnat killer, Hypoaspis miles, is a tiny, brown soil mite that feeds on fungus gnat larvae as well as thrips, springtails, and other soil-borne larvae. The adult predator, with its long legs and finely-haired back, punctures the larvae and feeds on what’s inside. Tiny and hard-to-spot, H. miles inhabits the top layer of soils and prefers moist conditions