Musca domestica This insect pest is common throughout the world. In addition to being annoying, it can spread several serious human diseases and parasites, such as diarrhea, dysentery, typhoid, cholera, intestinal worms, and salmonella bacteria. Several other closely related fly species, including face flies (M. autumnalis) and little houseflies (Fannia canicularis), may also infest the home. Flies feed on and lay their eggs in decaying organic materials. The eggs hatch within several days, even within 12 hours if conditions are ideal. The creamy white maggots (up to 1/3 inch long) burrow into and feed on the decaying material for several days, pupate, and then emerge as adult flies. Under warm conditions, the entire life cycle may be completed within 14 days. Cooler conditions will greatly extend this period, however. The adults usually live for 15 to 25 days.
To reduce the fly population, keep the house as clean as possible. Keep garbage tightly covered and dispose of it regularly. Maintain door and window screens in good condition.