Phorid humpbacked flies (also known as 'coffin flies' or 'sewer flies') are black, brown or tan in colour, and are tiny (0.4 mm to 6 mm in size). They are named because of the arch of their thorax, which gives them a humpbacked appearance.
Phorid flies are weak fliers and will often choose to walk rapidly rather than fly. They are often confused with fruit flies or gnats, and often need to be identified by a licenced pest control professional.
In homes and businesses, these flies breed wherever moisture exists – around plumbing and drains in bathroom and kitchen areas, garbage containers and disposals, crawl space areas and basements. A common food source for these pests is the mixture of moist organic matter that can accumulate in drains and plumbing.
Phorid humpbacked flies have the ability to transmit diseases. Since they prefer decaying matter as a source of food and place for reproduction, the risk of disease transmission is very high.
The phorid fly typically breeds in sewage, garbage, drains, human cadavers, rotting fruits and vegetables, garbage as well as damp organic materials. Females will lay about 20 eggs at a time and approximately 500 over the course of a lifetime. Depending on the habitat and environment, their life cycle from egg to adult ranges from 2 to 4 weeks.
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