Flies | PEST UK

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Flies

There are many different types of flies. Only the more common ones (as far as pest control is concerned) will be dealt with here. Treatment and remedy depend on the species and circumstances. The breeding site (if any) of flies is important. With Blowflies (Blue Bottles and Green Bottles), it will be a body of some kind, in the case of Filter or Sewage Flies it could be any damp organic sludge (could be caused by a water leak). Living in rural areas next to farmland (especially animal farms) can lead to periodic fly problems.

If you have any questions on other types of flies then please do not hesitate to contact us. Covered here are the following:

> House Flies and Lesser House Flies
> Fruit Flies
> Filter or Sewage Flies
> Blowflies (Blue and Green Bottles)
> Cluster Flies

House Flies and Lesser House Flies

These flies are common worldwide. The larva (maggots) feed on rotting organic material or animal faeces. Adults will travel several miles to feed, mate and lay eggs. They are disease carriers. spoil food and as well as being a nuisance in domestic premises House Flies and Lesser House Flies are a problem in animal houses and refuse tips.

Treatment

This depends on circumstances, a combination approach that may include insecticide application, fly screening and sorting out the breeding site. A common domestic treatment is for us to apply a residual insecticide to the walls and ceilings. This kills flies as they land on the treated surfaces and as the insecticide is residual will last 1-3 months inside. Prior to treatment, it is important that the surfaces to be treated are clean and dust-free. Putting items away or covering items such as cutlery, food, clothes, towels, toothbrushes, etc prior to the insecticide being applied is required. All the insecticides we used are biodegradable and safe. See Cluster Fly section for the insecticides used for fly treatments.

Fruit Flies

Common outdoors but may come inside to breed. The larva (maggots) feed on rotting fruit and vegetables, milk, beer and vinegar. They can transmit disease, be a nuisance and the pupal cases may contaminate food, bottles and packaging.

Treatment

As with House and Lesser House Flies, this depends on circumstances, a combination approach that includes insecticide application and sorting out the breeding site. A common domestic treatment is for us to apply a residual insecticide to the walls and ceilings. This kills flies as they land on the treated surfaces and as the insecticide is residual will last 1-3 months inside. Prior to treatment, it is important that the surfaces to be treated are clean and dust-free. Putting items away or covering items such as cutlery, food, clothes, towels, toothbrushes, etc prior to the insecticide being applied is required. All the insecticides we used are biodegradable and safe. See Cluster Fly section for the insecticides used for fly treatments.

Filter Or Sewage Flies

As the name says this fly is commonly associated with sewage works or sites with a similar environment. Surrounding houses may be affected.

Treatment

A specialised insecticide can be used on filter beds in sewage works. Flyscreens on windows and doors and insecticide treatments can be used on sites affected near breeding sites.

Blowflies (Blue/Green Bottles and Flesh Flies)

Common worldwide, larva feeds on meat. Adults travel miles in search of breeding sites. The maggots can cause problems and will leave the food source once ready to pupate, searching for a suitable place to do so. Maggots and flies are a problem in domestic refuse where bins are only emptied every 2 weeks. They are disease carriers and as well as a pest in domestic premises are a problem in slaughterhouses and related industries.

Treatment

A combination approach that may include insecticide application, Electronic Fly Killers (EFK’s), fly screening and sorting out the breeding site. Unlike House and Lesser House Flies Blowflies are attracted to EFK’s. Often in domestic premises the carcass the maggots were feeding on may be ‘finished with’ by the time the problem (adult flies and/or maggots) is noticed. A common domestic treatment is for us to apply a residual insecticide to the walls and ceilings. This kills flies as they land on the treated surfaces and as the insecticide is residual will last 1-3 months inside. Prior to treatment, it is important that the surfaces to be treated are clean and dust-free. Putting items away or covering items such as cutlery, food, clothes, towels, toothbrushes, etc prior to the insecticide being applied is required. All the insecticides we used are biodegradable and safe. See Cluster Fly section for the insecticides used for fly treatments.

Cluster Flies

How Do I Know If I Have A Problem?

If you have a Cluster Fly problem you will notice dead, dying or live flies around windows or in loft spaces. You may even see them sunning themselves on outside walls.
The time of year is important. If you are seeing flies in the Summer then they are probably another type of fly, maybe a Bluebottle or related species or perhaps House Flies.

Preparation Prior To Treatment

There isn’t much you can do prior to treatment but the insecticides used last much longer on clean dust-free surfaces.

Treatment

We will treat the infested and surrounding areas with one (or all) of the following insecticide sprays: Effect Microtech CS’* which contains Permethrin, HSE Number 6287, made by Sorex or Permost Uni, HSE Number 6399 which contains Permethrin and Tetramethrin and made by Hockley International or K-Othrine WG250, HSE Number 5390 which contains deltamethrin 25%. These insecticides are the most modern insecticide available. Also, a powder might be used called Ficam D*. This contains an insecticide in a dust formulation @ 1% w/w Bendiocarb. A smoke generator may have been used, this is called a Coopex Smoke contains Permethrin. The type of insecticide used will depend on individual circumstances and be decided by the technician.

All these insecticides are biodegradable, almost odourless, non-tainting and do not corrode or stain. They are not highly toxic towards mammals but are extremely so to all forms of crawling and flying public health pests. All the resting places will have been sprayed and possibly dusted.

What Do I Do Afterwards?

After treatment, do not let domestic animals walk on treated surfaces until dry and if bare skin comes into contact while wet then wash. As long as the surfaces that have been treated are not washed down the insecticide will remain active for up to 3 months. This really only applies to clean areas inside.

Guarantee

Dying flies may be seen in some numbers up to 4 weeks after treatment. There is a strong possibility that any survivors will build up their numbers to a nuisance level again in the following years. In fact, once a hibernation site is selected it will be used year after year. The treatment will not eliminate the fly infestation but kill the vast majority of flies present at the time of treatment, flies will take time to die, how quickly depends on temperature and how much insecticide they have absorbed.

Flies – General Information

Cluster and Swarming Flies

These flies may be found in large numbers in houses, usually lofts, causing annoyance to the occupants. They enter during the autumn to hibernate and leave in early spring, sometimes appearing on warm winter days. It is at these times when they become a nuisance and treatment is necessary.
There are 3 types of cluster fly: the most common type is parasitic on earthworms, the other 2 types are the Autumn Fly, and the Green Cluster Fly, both of these breed in cow dung. All 3 species lead solitary lives except when they gather in the autumn to hibernate.

Before moving into their hibernation place they will collect on the outside of buildings, especially on sunny walls before finding their way inside to form clusters of many thousands in such sites as roof spaces, under tiles, window frames and in window sash boxes. They are not a health hazard in the same way that House Flies are and are only coming into the building to hibernate, not to breed or feed.

Once a hibernation site has been chosen the flies’ descendants will use the site, the memory of the site seems to be passed on to subsequent generations. It is not understood how this happens.

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