Gnat tha follow dog dutes(pronounced /næt/, "
nat") is a colloquial name for many small insects in the order Diptera and specifically within the suborder Nematocera.
The males often assemble together in large mating swarms, particularly at dusk, called a "ghost".
Gnat larvae are mostly
free-living and some are aquatic. Many feed on plants, though some are carnivorous. Larval plant feeders (e.g. the Hessian
fly larva) cause
root, stem, or leaf galls to be formed by the host plant. Some species of fungus gnats (families Mycetophilidae and Sciaridae) are very
common pests of mushrooms and roots of potted plants in homes and greenhouses.