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Psychodidae, also called drain flies, sink flies, filter flies, [2] sewer flies, or sewer gnats, is a family of true flies. Some genera have short, hairy bodies and wings, giving them a "furry" moth-like appearance, hence one of their common names, moth flies . [ 2 ]
Adult Sciaridae are small, dark flies 1–11 mm long and usually <5 mm long. [4] They have a characteristic wing venation: there is no cross vein except for a short rs at the wing base, the anterior veins are a short R1 and a long R5, vein M has a simple fork with a long stem, and CuA1 has a fork with a short stem.
Liriomyza trifolii, known generally as the American serpentine leafminer or celery leafminer, is a species of leaf miner fly in the family Agromyzidae. [4]L. trifolii is a damaging pest, as it consumes and destroys produce and other plant products.
In houseplants, the presence of sciarids may indicate overwatering; they may be feeding on roots that have been immersed in water too long and are thus rotting, or the gnats may be attracted to fungus growing in saturated topsoil. Consequently, allowing the top two inches of soil [12] to dry may reduce their numbers. [13]
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In general, gnats go through the four life stages of egg, larva, pupa and adult, [6] similar to other flies. The fungus gnats lay their eggs in moist organic debris or soil, which hatch into larvae. The larvae feed on organic matter such as leaf mold, mulch, compost, grass clippings, root hairs and fungi.