Fact File - Flies
There are four species of flies that are typically found in New Zealand (1) the Common House Fly, (2) the Lesser
House Fly, (3) the Cluster Fly, and (4) the Blow Fly.
These flies have a life cycle that travels from egg, larva, pupae, and then adult. During the winter months flies tend to go to sleep. However, when the temperature and humidity rises they awaken to be an annoying little pest that carries bacteria, pathogens and disease.
Flies are generally found in organic matter, decaying vegetation, animal excrement, and stagnant water. Odours, such as cooking, can attract flies up to 50 metres from their breeding site. If the wind is right, they can travel several kilometres.
How we treat flies
No treatment will stop flies from coming inside. Flies rely on air currents and smell. If windows and doors are open and cooking is in progress then flies will move in.
All flies require a similar pest control treatment. An external pesticide surface treatment is applied in areas where flies typically land such as entry points (e.g. doors and window frames). A surface treatment is also applied inside on walls, ceiling, window sills and door frames, particularly in problem areas.
The treatment works on residual contact. The insect has to absorb the pesticide by crawling over, or landing on, the product. The pesticide then kills the insect by affecting the nervous system.
In some situations, a low pressure automated aerosol unit can also be set up so flies fly through the mist.
Aerosols are useful in the control of cluster flies as they are less likely to land on the product. Fly traps are available for outside use. Through smell, the trap attracts the flies to a container that then traps them.
Flying insect light traps are available for both outside and inside use. They work with ultra violet light, which attracts flying insects into the unit. The unit has a sticky board and traps the insect. The sticky boards have to be replaced once a month and the unit requires a power point.