Major species of flies
House fly – These pests can spread microorganisms such as bacteria, fungi and viruses to the surfaces on which they land. They also can regurgitate during the feeding process, which enables them to transmit disease organisms to their landing surface.
Drain / Sewer Fly– Sometimes called moth flies because of their appearance, drain flies are covered with long hairs and breed in and feed on decaying organic material. They are also known as filter and sewage flies, since they commonly breed in raw sewage under slabs where undetected broken pipes may be located. Like mosquitoes, drain flies need standing water to breed.
Fruit Fly– Averaging 1/8-inch long, these small flies prefer to lay their eggs near fruits and vegetables, in addition to other decaying organic material. Fruit flies abound near fermented materials in trash cans and floor drains. Several species of fruit flies can be a problem: the black-eyed fruit fly (Drosophila replete) can often be a problem year-round.
House flies are strongly suspected of transmitting at least 65 diseases to humans, including typhoid fever, dysentery, cholera, poliomyelitis, yaws, anthrax,tularemia, leprosy and tuberculosis. Flies regurgitate and excrete wherever they come to rest and thereby mechanically transmit disease organisms.