Flies of many kinds have affected man and his welfare for thousands of years. Domestic flies have evolved to live in close association with man. They are normally found around and within structures and can become extremely annoying by their constant presence.
Flies are identified with disease-causing organisms. They have filthy habits which make them efficient mechanical vectors of disease. Pathogenic organisms are picked up by flies from garbage, sewage and other sources and then transferred on their mouthparts and body parts, through their vomitus or through their faeces to human and animal food.
All flies have a complete metamorphosis with egg, larval, pupae and adult stages.Flies remain as close as possible to their breeding grounds and are seldom found in large numbers more than half a mile away. The tropical house flies commonly rest outdoors at night on herbage and on the lower branches of trees and shrubs.
By day house flies are commonly found indoors in kitchens, markets, hawker stalls, shops, restaurants, toilet, animal sheds, on food or on the floor and elsewhere. We can also find them outdoor on breeding sites or on the ground, especially places that are contaminated with garbage and food waste.
– Installation of screens (eg wire mesh, polyethylene mesh) at entrances will block housefly intrusion.
– Traps (sticky fly-paper, UV light trap, cone fly trap) are usually in monitoring and controlling adult houseflies.
– The application of insecticides (ULV space spray, residual spaying, toxic bait) is preferred due to its fast suppression of the house fly population thus providing quick control results. However, chemical control does not provide a long-term solution because house flies have shown the capability to developing resistance quickly to insecticides if continuously exposed.