Where Do Flies In The House Come From?

Filthy Flies In Your Home - Why?

bristol fly control - cluster fly
Bristol Fly Control - Why You Have Flies In Your House.


Flies appear in our homes for a wide variety of reasons, but not all of the flies we come across are dangerous. It all boils down to the life cycle of the fly in question and the environment in which its life cycle revolves.

Here I we will consider 4 of the most commonly encountered fly problems and look at the causes and the solutions.

1. Flies in your attic or loft

2. flies in your kitchen

3. Flies in your bathroom

4. Sudden appearance of large green and blue metallic flies.


Flies in the loft and attic?

Flies in your attic, loft and crawl spaces etc are normally what we would term cluster flies.

These lethargic, nuisance flies appear in the autumn and overwinter through the coldest months until the warmer days of spring encourage them to emerge. They are an annual problem. 

Cluster flies are also parasites of earth worms, so are not considered import carriers of disease for humans.

The most common worms of control are proofing (almost impossible), Fumigation (very effective in severe infestations) and UV light units (great for residual control).

Flies In the kitchen?

Flies in the kitchen are most commonly house flies (7mm) and fruit flies (3mm).

Fruit flies and many other small black flies of the same size are commonly associated with organic matter such as food residues. 

These residues are most commonly aloud to build up behind kitchen counters, under kick boards/plinths and down the sides of kitchen appliances etc.
In many cases, Fruit flies are not seen as important carriers of disease, but are seen as a sign of poor cleanliness.

The best remedy for these flies is housekeeping. Steam cleaning tools are a cheap and amazingly fast way to eliminate food residues and any eggs, larvae and pupae.

House flies ARE considered important carriers (vectors) of disease.

House flies most commonly come into homes through open doors and windows. The best treatment for these is observation. Watch what surfaces they most commonly land and rest on (light fittings etc) and then treat these surfaces with insecticide. 

When a house fly lands it will taste what it lands on, so will be killed very quickly by the chemical.

Flies in the bathroom?

Flies in your bathroom, most commonly come from faulty soil pipe seals, sink over-flow cavities and extractor fans.
  
The best form of treatment is repairs to any faulty or leaking pipe work, steam cleaning and sanitizing of any overflow points and shower trays etc.

For extractor units, a fine mesh can be fixed over the extractor vent. This is best done externally. Sometimes the plastic hose will have become displaced in the loft, so just needs to be re-connected.

Any flies in these area should be considered carriers of disease.

Large metallic flies?

These are commonly called blow flies and are significant vectors of disease, because their life cycle revolves around dead animals or carrion.

They often appear in their hundreds or in rare cases thousands. simply put, the more flies, the larger the body they have been feeding on.

In most cases birds, mice, rats and squirrels will be the most common source of the flies and you will often have a history of a bad smell some weeks before, and then of flies suddenly emerging in large numbers over night.

These flies will quickly begin to decline in number until about 14 days later, when virtually all will have hatched from pupae, emerged and escaped or been killed by your control measures.

What makes solving some fly problems more difficult, is that the mature maggots will leave the food source and wriggle of into the fabric of the building, making a single control treatment almost impossible.