Fungus gnat

Moist soil rich in organic matter, especially potting soil and greenhouses; adults often gather around plants.

Larvae feed mainly on fungi and decaying matter in soil, sometimes nibbling plant roots; adults consume little or no food.

Adults are weak fliers and often hover near soil. Larvae develop in damp soil, with several generations possible indoors each year.

Usually harmless to people and pets; large larval populations can damage seedlings or roots. Larvae also help break down organic matter.