Cluster Flies

Find out about the range of cluster fly treatment products available from Pest Expert

Professional Fly Killer Products
At Pest Expert we specialize in the production and supply of the highest quality cluster fly control products - including smoke bombs, Foggers, fly sprays, and fly killer units, enabling both professional and amateur users to carry out a simple and effective fly treatment.

While many businesses including shops, bars, restaurants and other food premises are often affected by infestations of house flies, fruit flies, drain flies and other flying insects, another very common pest fly is the cluster fly.

What are cluster flies?
Cluster Flies (Pollenia rudis), also referred to as loft flies or attic flies, are a pest typically associated with rural locations. They live outside during the summer months but invade homes and lofts in their hundreds and sometimes thousands during the autumn, winter and spring. The cluster fly typically measures 6-10mm in length and has a dark grey to olive thorax.

During the summer months and on sunny days cluster flies can often be found outdoors congregating on posts, walls and fences. Cluster flies migrate indoors in the autumn and winter months, with many people reporting large numbers in their loft or around windows on lower level floors. As mentioned, the purpose of this invasion is purely to hibernate and not to breed or lay eggs. During the hibernation period and cooler months, they tend to be sluggish in flight, and often appear almost dead when discovered on floors and window sills in homes, particularly on cooler days. However, when the sun comes out heating rooms, lofts, and roof spaces they occupy, this can often awaken them, triggering activity.

As well as finding flies in loft spaces, homes with sash windows can also suffer with infestations in living rooms and bedrooms as the design of the window mechanism can provide easy access. Downlights in ceilings can also provide access to bedrooms, as they will travel down from lofts, emerging through surrounding gaps. Velux window are another favoured spot where they are likely to congregate.

Cluster flies are almost impossible to eradicate. As they breed outdoors during the summer, even if you kill all the flies in your loft during a season, chances are that another batch will migrate into your home again next year. It is this cycle which unfortunately means many people suffer with infestations year on year, and season after season. The only real solution to this is to carry out periodical cluster fly treatment using smoke bombs or Foggers as and when you notice activity.

What is the most effective cluster fly treatment?
The best method of cluster fly treatment and fastest route to eradication is firstly to kill off and flush out any flies from within a loft, attic or roof space. This is best achieved by using either our Pest Expert Formula 'P' Smoke Bombs or Foggers both of which deliver a rapid knockdown of cluster flies, immediately clearing an infestation from a loft or roof space.

However, as neither smoke bombs nor Foggers offer any ongoing protection, once fumigation has been carried out, cluster fly control can be maintained by applying one of our residual insecticides such as Pest Expert Formula 'C' Cluster Fly Killer Spray and Pest Expert Formula 'P' Cluster Fly Powder to window frames, roof timbers and any other alighting surfaces.

This creates an effective cluster fly control to hopefully prevent further infestations, although it is recommended to regularly check potential infestation sites and where necessary re-apply the cluster fly killer or the cluster fly treatment that you are using. It's a small measure to prevent having to fumigate your loft every year.

In addition to our bestselling Cluster Fly Control Kits, which contain a combination of our best cluster fly products along with step-by-step instructions for treatment, all our products can be purchased individually below.

10 Product(s)

Cluster Fly Control Kit (with Formula 'P' Smoke Bombs)

This Cluster Fly Control Kit contains a selection of our best cluster fly killer products to enable you to carry out a successful cluster fly treatment and eradicate cluster fly infestations in your home or loft. The Pest Expert Formula 'P' Fumers are smoke bombs which deliver a fast knockdown of cluster flies, while the Pest Expert Formula 'C' Cluster Fly spray and Formula 'P' Cluster Fly Powder offer residual protection to maintain cluster fly control for up to 12 weeks.

Price £29.95 incl. VAT

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Cluster Fly Control Kit (with Formula 'P' Foggers)

This Cluster Fly Control Kit contains a selection of our best cluster fly killer products to enable you to carry out a successful cluster fly treatment and eradicate cluster fly infestations in your home or loft. The Pest Expert Formula 'P' Foggers are an aerosol fumigation device which deliver a fast knockdown of cluster flies, while the Pest Expert Formula 'C' Cluster Fly spray and Formula 'P' Cluster Fly Powder offer residual protection to maintain cluster fly control for up to 12 weeks.

Price £44.95 incl. VAT

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Pest Expert Formula C Cluster Fly Spray 1Ltr

Pest Expert Formula C+ Advanced Cluster Fly Killer Spray is the new and improved formulation of our bestselling ready-to-use triple action cluster fly killer, with a long-lasting residual that maintains cluster fly control for up to 12 weeks. Its unique combination of actives make it the most powerful cluster fly spray available to the amateur market, and the ultimate insecticide for anyone wanting fast and effective eradication of any size cluster fly infestation. This 1L canister will treat up to 50 sq m in a single application.

Price £11.95 incl. VAT

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Pest Expert Formula C+ Cluster Fly Spray 5Ltr

Pest Expert Formula C+ Advanced Cluster Fly Killer Spray is the new and improved formulation of our bestselling ready-to-use triple action cluster fly killer, with a long-lasting residual that maintains cluster fly control for up to 12 weeks. Its unique combination of actives make it the most powerful cluster fly spray available to the amateur market, and the ultimate insecticide for anyone wanting fast and effective eradication of any size cluster fly infestation. This 5L canister will treat up to 250 sq m in a single application.

Price £31.95 incl. VAT

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Pest Expert Formula P+ Cluster Fly Killing Fogger

The Pest Expert Formula 'P' Cluster Fly Killing Fogger is a fast-acting aerosol device containing a powerful insecticidal gas that will flush out cluster flies from lofts, roof spaces or other areas of the home. Formula 'P' Foggers contain the same active ingredient as traditional smoke bombs but treat a slightly larger area and offer a safer alternative as they do not need to be lit. (From only £6.75 each when ordering multiples).

Price £8.95 incl. VAT

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Pest Expert XL Formula P+ Cluster Fly Killing Fogger (530ml)

The new Pest Expert Formula 'P+' Power Fogger is a super-size version of the regular Fogger, ideal for treating cluster fly infestations in lofts and open-plan areas. Simple push-down trigger mechanism. Contains 100% natural pyrethrins for a safe yet effective knockdown. Each 530ml canister will treat over 300 cubic m for flies.

Price £12.95 incl. VAT

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Pest Expert Formula P Fumer Cluster Fly Smoke Bombs (Twinpack)

The Pest Expert Formula 'P' Cluster Fly Smoke Bombs are a fumigation device for eradicating cluster fly infestations and are an essential part of any cluster fly treatment. Once lit, they release an insecticidal smoke that will flush out cluster flies from your home or loft. (From only £2.66 per smoke bomb when ordering multiples!).

Price £6.95 incl. VAT

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Pest Expert Formula P Pro Fumer Cluster Fly Smoke Bombs (Twinpack)

The Pest Expert Formula ‘P’ Cluster Fly Pro Fumers are essential in a comprehensive cluster fly eradication process. With 7g of Permethin, this highly effective smoke bomb is twice as powerful as the standard smoke bombs. Once lit the smoke bomb will smoulder and release an insecticidal smoke which will target the cluster fly life-cycle at surface level and will not leave any nasty residues on carpets, clothing or furnishings.

Price £8.95 incl. VAT

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Pest Expert Formula P Cluster Fly Super Fumer Smoke Bomb 11g

The Pest Expert Formula 'P' Cluster Fly Super Fumer Smoke Bomb is more than three times the size of a standard Fumer providing effective coverage to an area 3 times greater, which makes it the perfect fumigation device for eradicating cluster fly infestations in larger spaces such as lofts and open-plan living areas.

Price £6.95 incl. VAT

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Pest Expert Formula 'P' Cluster Fly Powder 300g

Pest Expert Formula 'P' Cluster Fly Powder is a highly effective cluster fly killer with a long-lasting residual for maintaining cluster fly control. Supplied in an easy-to-use puffer pack, Formula 'P' should be applied to roof timbers and other alighting surfaces and any obvious entry points or harbourages.

Price £6.95 incl. VAT

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Find out about the range of cluster fly treatment products available from Pest Expert

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