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The Bluebottle Fly

The bluebottle fly is a domestic pest. It is also known by its Latin name Protophormia Terraenovae. It belongs to the family Calliphoridae. The species is widespread throughout Europe. What makes this fly stand out from your ordinary house fly is its abdomen. It is light blue in colour and has an unmistakable metallic glaze. Those are the knights of flies. They have short antennas, that won’t tangle while the flies ramming their chests in battle.

They have four tarsi per leg and they even have spiked armour to protect them in battle! Those are the key markings of the blue bottle fly that distinguishes it from other species. However, it does look a bit like the green bottle fly and it could be mistaken if you see it under direct sunlight or if the fly is in mid-air. Once it lands, however, your confusion will be gone. You can clearly see the colour, once the fly is in one place.

Blue Bottle Fly Eggs and Maggots

Gross smells are what attracts adult bluebottle flies. Why? Because the smell is a sign that tells them something is rotting away. They lay eggs in dead animals, feces, any rotting organic matter.

The eggs will soon (2-3 days) hatch into bluebottle fly maggots. They will start eating their way out and will be fully grown in about three days. The maggots then hide in the soil or somewhere else dark and with high humidity, like inside your bin or under the kitchen sink.

The maggots will pupate into cocoons. After two weeks, your brand new batch of bluebottle flies would be ready to cause trouble.

How Your Home Get Infested With Bluebottle Flies

The infestation of your house usually starts from your basement or attic. Sometimes from electric systems, garden compost bins and others. In other words, anywhere that a dead animal can be, or wherever there is any organic matter disintegration going on.

Poisoned rats die in the basements, birds can die on your roof or attic. Organic matter is rotting in your garbage bin and in your compost bin. All those are ideal places for a blue bottle fly to lay its eggs in.

The Dangers of Infestation

This pest is hard to get rid of, mostly because they usually stick in groups and communicate with each other. Once a single fly gets the scent of food, it will contact the others using a pheromone and will rush to the coordinates. We have already mentioned that those are the knights of flies. They are bigger and stronger than your ordinary house fly, and those are pretty hard to get rid of.

The blue bottle fly also lays its eggs in human food! Now, this is where it gets repulsive! This is a serious health risk! The very landing of those flies on your food can transfer bacteria. You already know what is attracting them, so you can imagine the gross things their legs have touched before landing on your meal. The human body has its ways of dealing with most of that bacteria, but still, there is also the “disgust” factor. The slight chance that this fly may carry “something else”, like the Salmonella Typhi, is also disturbing.

Swallowing the eggs of a blue bottle fly can lead to myiasis. Myiasis is the infestation of your body with fly larvae. This will make you the host of the larvae and it will grow inside of you and feed off your tissue.

The worst thing is that bluebottle flies can turn other pests into vector agents. Vector agents are the insects or surfaces chosen from the bluebottle fly to transmit their larvae to you. In other words, she can hire another insect to infect you, or just set a trap. Those vector agents can be anything – from common house flies to even moist dirt. The blue bottle fly can infest a human being even without any open wounds. Usually, flies that are capable of myiasis prefer filthy tissue or open wounds. However, this fly knight can do it all.

Blue Bottle Fly Facts

Blue Bottle Flies and Hibernation

This fancy flying menace usually hibernates during the winter. However, if the fly finds a warm place to continue feeding and reproducing, it will gladly take on the offer. Open windows and doors to human homes are the invitations the fly waits to receive. It can also get inside through cracks or just lay its eggs there in order to save them. Once in your beloved home, it will lay eggs around and will annoy you until it gets the better of you and provokes your rage.

What Do Blue Bottle Flies and Bees Have in Common?

Bluebottle flies are actually pollinators. This means that they help flowers and plants to breed, just like the hardworking bees. There is a big difference, however. Bees prefer plants with pleasant smells. Flies, on the other hand, pollinate plants like “Dead Horse Arum”, “Golden Rod” and last but not least “Skunk Cabbage”. And yes, it does deserve its name. The stench and appearance of those grotesque flowers are what invites flies to pollinate them.

Reproduction Facts

All of the bottle flies (blow flies) feed on the nectar of flowers in order to make their eggs even stronger. A female can lay around 2000 eggs in her lifetime (around 6 weeks). Those eggs will hatch pretty quickly, around two days if the moisture level is right. The larvae hatched from the eggs can get up to 20 mm in length.

Bluebottle Fly Facts in Numbers

  • The eyes of the bluebottle fly are made out of 8000 facets.
  • The bluebottle fly can smell things 750 yards away.
  • A bluebottle fly can travel 300 times the length of its body in a single second.
  • The wings of the fly move at a rate of 200 times per second.

How to Get Rid Of Bluebottle Flies

They are still flies! Yes, bigger and badder, but still flies. Insecticides are what gets them. They also have the same habits as the ordinary house fly. So, they will fall for sticky surfaces and homemade traps.

Always be mindful of the Myiasis and the bacteria they are carrying. The presence of those flies in your property bares some health risks, action must be taken swiftly.

Install fly traps around your home and don’t leave food with no cover on top, at least till you limit the population of the flies.

If you have any doubt about the presence of a blue bottle fly, better call a specialist to investigate. Better safe than sorry, right?

A specialist can examine the property and use the best insecticides to counter all stages of the fly evolution. In other words, kill adult flies, larvae, and eggs. If the infestation is severe, it may need a heat treatment, from which flies have no chance of escaping.

12 Responses

  1. Stephanie Farham says:


    A family member has bluebottles flies coming out from a crack behind their fire. They did have a gas fire but now it’s been blocked with bricks. The flies are coming out from a small crack. They have sprayed with fly killer. If they sealed the crack would that sort the problem.

    • It would be great if there is a way to check where this crack is going.

      I assume that there is no way to do that, without the help of a handyman… It will most likely involve the removal of a couple of bricks.

      Sealing the crack may resolve in:

      A: trapping the flies there and killing them.
      B: forcing them to find another way out.

  2. Kirsty Grimshaw says:

    Hi there…. Are you aware of there being a HUGE number of greenbottles at the moment?! Due to the heat?! This is our first summer in this house and there are literally hundreds of them in the garden…. I have large fly traps and am trapping hundreds in a matter of a few days?! I can’t find anything dead in the bushes or anything?! Just wondering what else I can do…. Thanks

  3. Montserrat says:

    We have just returned from our holidays and found more than 50 dead bluebottle flies in various places in our house, mainly downstairs, not in the bedrooms. We cannot think of anywhere that they could have come from as all the windows were closed. We have also checked for vents, fans in bathrooms and other possible ways in, but cannot find anything. We have even checked for any dead rodents, but found nothing. Any suggestions?

  4. Rebecca Shrubb says:

    Hi we have had numerous bluebottles in our upstairs area of the house. After investigation we have narrowed it down to the attic area. My husband is going to try and search attic to see if he can find the source we have spray and dettol speay to clean is there any thing else we can do ??

  5. Geoff Frampton says:

    Decades ago bluebottles seemed to be everywhere and I don’t really remember seeing greenbottles back then, but in the last few years I have seen only greenbottles, not bluebottles. A few friends and colleagues noticed the same. Are you seeing any general patterns in the numbers of greenbottles versus bluebottles and if so are there any explanations you’re aware of?

  6. Eltringham says:

    How do you treat maggots and eggs round a pet rabbits bum?

    • Ahm… We don’t treat rabbit bums, to be honest. 🙂 You will have to clean it regularly. Also, block entryways of flies to inside your home and discourage them from staying.

      We can treat your property, but not your rabbit 🙂

  7. Laurie Barker says:

    Hi. I keep finding young blue bottles in the house. I’m guessing they are young as they are easily caught.
    No dead animals lurking or food laying about. House is clean. For the life of me I can’t find where they are coming from. Its driving me nuts now after 4 days of it. Usually about 6 to 7 per day.

  8. Laurie Barker says:

    The question someone asked about rabbits bums and maggots. It cleaning the cage and the rabbit regularly to prevent it 🙂

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