Flies

house-fly

Appearance

There are numerous separate fly species each of which has a different appearance. The majority of flies have bean-shaped bodies, often dark brown in colour. True flies are distinguished by other insects with “fly” in their names (such as dragonflies, butterflies and fireflies) by their wings. Flies have a single pair of transparent flight wings, attached to the mesothoracic part of their body. In contrast, most other insects have dual pair of wings and are rarely transparent. Their also have compound eyes.

Fly Species & Health Hazards

If we are to list all fly species in the UK, we will need a whole book. More than 120,000 types of true flies are known to humans, and the majority of them are cosmopolitan. We will discuss only those considered as typical pests.

  1. House Fly (Musca domestica)
    house-fly

    House Fly
    (Musca domestica)

    Among them, the most common is the house fly. It is also the biggest disease vector. It carries more than 100 pathogens, including salmonella, typhoid, tuberculosis, anthrax, cholera and dysentery. House fly is an umbrella term for two different species of flies. Both share the same appearance. House flies are mostly grey and have a distinct dual stripe on their thorax. The only difference between them is the size—the Common house fly reaches 5mm up to 8 mm in length, while the lesser house fly can reach between 3mm and 6mm in length.

  2. Bluebottle Fly (Calliphora vomitoria)
    bluebottle-fly

    Bluebottle Fly
    (Calliphora vomitoria)

    Another well-known disease carrier is the Bluebottle fly. Its appearance is similar to the appearance of the House fly. As the name suggests, bluebottle fly is blue in colour, with a shiny tint. Even though bluebottle infestations are infuriating, these insects can also be beneficial to humans. Bluebottle flies are used in forensic science, where they help determine where or not a dead body has been tampered with. They also have medical applications. Sterilised larvae of the bluebottle fly are used in maggot therapy. The larvae are introduced into wounds of a human or animal where they eat the dead tissue and leave the healthy one intact.

  3. Horse Fly (Hybomitra micans)
    horse-fly

    Horse Fly
    (Hybomitra micans)

    The horse fly is the worse enemy to the live stock. It has a painful bite which can cause infection in animals. They bite humans as well, though their bites rarely result in infections. There have been isolated instances where bites cause deadly allergic reaction. They have a scissor-like mouth and pointed rear end. Horse flies are dark brown in colour, with shiny green or black eyes. They are also bigger in size and can reach up to 25mm long. They spread various blood-borne diseases and can suck up to 300mm of blood from an animal a day.

  4. Other Common Fly Species
    lacewing

    Lacewing (Order Neuroptera) is a green, slender predator which feeds on spider mites

    white fly

    White flies
    (Trialeurodes vaporariorum)
    are small, 3mm long pests on agriculture

    fruit fly

    Fruit flies (Family Drosophilidae), associated with the fermentation process and used in scientific research

    crane fly

    Crane flies (Nephrotoma appendiculata), also known as Daddy long legs flies

None of them pose any threat to humans or animals.

Habits

There are many flying insects but there is a reason why true flies are called “true”. While not as enduring as other winged species, flies can still travel over several miles a day. Their specific compound eyes give them a wide vision of field and allow them to detect any movement. This is the reason why flies are so hard to kill with yesterday’s newspaper. Because of the specifics of their mouths, house flies and horse flies feed only on liquids—blood, plant sap, fruit juices and water. Bluebottle flies feed on rotten organic material and faeces.

Causes of Fly Infestation

The most common fly species in the UK: house flies, horse flies and bluebottle flies, are attracted by rotting organic material and excrement. Carcasses of animals such as dead rodents are the perfect breeding ground and flies are among the first species to lay eggs inside the corpse. A batch consists of up to 200 individual eggs. Combined with their short week-long life cycle, this results in massive infestation in a matter of days.

Signs of a Fly Infestation

Spotting a few flying insects in your home doesn’t mean you have a fly problem. Even if you do, the source of the infestation must be located before any measures are taken. If flies are a permanent sight around your property, there might be a food source nearby which allows them to breed. Search for maggots and rotten organic material near your premises. You may also observe clusters of dark spots on your walls—faecal matter of house flies.

How to Deal With Flies in the House

There is no effective prevention against flies other than sanitation and high hygiene standard.

  • Make sure there are no rotten leaves, animal carcasses, fruits or food around your property.
  • Dispose your bin on a frequent basis and avoid overfilling.
  • Seal off all sewage and make sure there are no spills or leaks.

There are variety of methods to battle house fly infestation. Insecticides, sticky paper and electronic fly zappers. You can also find countless home-made remedies online, although they are not very effective. Zappers won’t do for bluebottle infestations. Sticky paper attracts them but since it doesn’t affect their breeding ground, it doesn’t stop them from reproducing. Approved pesticides and insecticides remain the most effective method to battle flies infestation.

Resistance

Scientists have reported some strains of house flies and bluebottle flies are resistant to the most common pesticides used against flies. Flies have demonstrated high tolerance levels to neonicotinoid, pyrethroid and nithiazine.

It is also important to note there is a possibility house flies carry antiobiotic-resistant bacteria from animal farms to urbanised areas. This might be an answer to the question how some bacteria strains develop resistance to medications at such rates.

What To Do in Case of an Infestation?

  1. Remove all potential food sources—rotten organic matter, sewage, fruits, sugary substances and greasy patches.
  2. Keep pet food covered and put your food back in the fridge.
  3. Cover your windows and keep the indoors of your property dimly lit. Leave a small, bright opening for flies to escape. Once they go outside, it is unlikely they will go back inside if there’s no food source to attract them.

Images by: 1. Benjamin Watson, 2. James Lindsey, 3. gbohne, 4. John Tann, 5. leppyone, 6. John Tann

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