| The moth fly is a holometabolous insect (having four very different life stages) in the Psychodidae family of the Diptera order. It is a very small fly, generally 1 mm to 5 mm long. It is covered in silvery-gray hairs, giving it the appearance of a small moth. Its wings are quite broad and oblong, which prevents it from flying long distances.|| Moth flies lay their eggs in clumps of 30 to 100 eggs. The eggs hatch within 48 hours. The larvae and pupae develop in organic matter, such as silt clinging to the walls of water pipes and drains. The larvae take between 9 and 15 days to develop, but the pupal stage lasts only 20 to 40 hours. The emerging adult is sexually mature and can reproduce.|
If moth flies develop indoors, it is generally due to silty drains. Silt often builds up drains (in basement floors, sinks, baths, and showers, etc.) that are rarely used. The adults can be seen flying nearby, and their presence may signal a damaged pipe or sewer backup.
For more information on Moth Fly, please read issue 23 of our technical newsletter The Gatekeeper.
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