Cluster Flies

Cluster Flies



blackish, with fine golden hair on thorax ( sometimes rubbed off)


Adults 6mm long


Adults live harmlessly out of doors in summer but may enter buildings (usually roof space and lofts but also through windows into rooms) in autumn to hibernate, sometimes in vast numbers. 

  • Eggs: laid in damp soil, rooting vegetation. Hatch in about a week 
  • Larvae:soon after emergence see out and parasite earthworms which are eventually killed. Development for several weeks.
  • Pupae: in soil.
  • Adults: 6mm long.  Often two generations per year

May be a severe nuisance if large numbers of adults enter inhabited parts of buildings. Some buildings are infected each autumn year after year.


 Control of the pre-adult stage is not possible. Sealing entry points is also difficult. Residual sprays or knockdown space sprays when necessary.

cluster fly
What are cluster flies? Pest Control Advice

Cluster flies (or Pollenia Rudis) are a type of fly that is commonly found in homes throughout the United Kingdom. They are large, slow-moving flies that are usually dark in colour and have a distinctive pattern of yellow or gold hairs on their thorax. Cluster flies are usually found in areas where there is a lot of vegetation, such as gardens or fields, and they often enter homes in the late summer or early fall.

These flies feed on the larvae of earthworms, and they lay their eggs in the soil near the worms. When the eggs hatch, the larvae feed on the earthworms and then pupate in the soil until they emerge as adult flies. Once they reach adulthood, the flies will congregate in large groups, hence their name. Cluster flies have a very short lifespan, living for only about a few weeks, and they are attracted to light sources.

Sometimes cluster flies can cause a great deal of annoyance in homes, as they can enter through small cracks and crevices in the walls or windows. They are drawn to the warmth of the home and can often be seen buzzing around windows and lights. They are also drawn to food sources, such as fruits, vegetables, and garbage. It is important to note that cluster flies do not bite or carry any diseases, so they are not a health hazard.

In order to prevent cluster flies from entering your home, it is important to seal off any cracks or crevices in the walls or windows. You can also install window screens to keep the flies out. If you already have an infestation, there are several methods of control that can be used, such as using insecticides or traps.

Pest Control for Cluster Flies

Cluster flies can be a nuisance for homeowners, as they often enter homes in the late summer or early fall. The most effective way to control cluster flies is to prevent them from entering your home in the first place. This can be done by sealing off any cracks or crevices in the walls or windows, as well as installing window screens.

If an infestation has already occurred, there are several methods of pest control that can be used. One option is to use insecticides, such as pyrethrin-based sprays, which can be applied both indoors and outdoors. These sprays will kill any adult cluster flies and their larvae. Another option is to use traps, such as fly light traps, which are specifically designed to draw in and trap cluster flies. These traps should be placed near windows or other entrances to the home, and should be checked and emptied regularly.

It is also important to remove any potential food sources, such as fruits and vegetables, as well as garbage, to reduce the likelihood of an infestation. Finally, it is important to keep your home clean and free of dampness or moisture, as this can attract cluster flies.

Overall, cluster flies are a nuisance, but they can be controlled and prevented with the proper pest control methods. It is important to take preventive measures to keep them out of your home, as well as to use insecticides or traps to get rid of them if an infestation occurs.

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