Meet the House Fly
February 11th, 2009 Posted in Flies & Gnats
Houseflies are those tiny flies that congregate around your smelly garbage and your dog’s poop (gross!) They are commonly known as parasites and have gotten a bad wrap as major nuisances that buzz around your home and stare down at you from the ceiling. But are houseflies really pests?
This article will explain:
- House fly facts – what do they look like? Where do they live?
- Life cycle of the house fly
- Pest Status – are they dangerous?
- House fly control – ways to control house flies

House Fly Facts
Houseflies (Musca domestica) are well known because they survive by living in your house (much like your freeloading cousin.) They bear a striking resemblance to many other flies. Stable flies, for example, are NOT houseflies, but are most often mistaken for them.
Appearance:
- ¼ inch long
- Gray to black in color
- Clear wings
- Four dark stripes on the thorax
- Females larger than males
Where houseflies are found:
- Garbage
- Feces
- Manure
- Rotting lawn clippings
- Anything warm, moist, and/or rotting
Houseflies are also known for their unique ability to hang from the ceiling, Tom Cruise in Mission: Impossible style.

Life Cycle of a House Fly
A house fly goes through four stages of life- a full metamorphosis.
Stages:
- Egg
- Larva
- Pupa
- Adult
Females lay up to 150 eggs at a time in soft, wet places like manure or decaying plants or animals. They are very small and white, like small grains of rice.
Eggs turn into larva after about 12 hours. A house fly larva is called a maggot. A maggot looks like a small white worm with a pointed mouth and beady black eyes. And a larva has two holes on its behind (yes, its butt!) that are used for breathing. It spends all its time eating, growing, and molting (shedding its skin, like snakes do).
After 5 days, the larva turns into a pupa. A pupa is a brown case that houses the larva, which is now inactive. Over a period of 3-6 days, the larva steadily grows into an adult house fly.
The adult stage is the final stage of the house fly. The house fly breaks open the pupa and emerges with wet, soft wings. (Once the house fly breaks through the pupa it will not grow any larger.) The wings dry and the fly’s blood flow hardens them, and it is now ready to infest your garbage. And, after 2-3 days, it is ready to breed (ensuring infestation for years to come!) The house fly will survive anywhere from 15 days to 2 months.
Pest Status
While they can’t bite you, houseflies are most certainly pests (just like that cousin that won’t leave.) They are even classified under the name “filth flies” because they congregate and eat in disease-ridden places.
They only eat liquids, but can also liquefy solids. To do this, almost like a sci-fi mutant bug (or a cow), they regurgitate (vomit) the solid onto human food.
And that’s why they’re dangerous! They spread diseases because you ingest their fly-vomit on your food…disgusting! And if you think that’s gross, check out some of the diseases they carry.
Diseases houseflies carry:
- Typhoid fever
- Cholera
- Dysentery
- Salmonella
- E-Coli
- Leprosy
- Even anthrax!
House Fly Control
Houseflies can become not only a major annoyance but a major health problem, too. Prevention is the easiest way to avoid the diseases these little buggers spread. But if you already have an infestation, there are steps you can take to send them to fly heaven (if all dogs go to heaven, maybe flies do also).
Prevention
Now you know about the diseases houseflies can spread, but how can you stop them from ever getting the chance to infect your family?
- Effective trash disposal is key to preventing fly breeding. Make sure your trash cans have tight fitting lids and take your trash out regularly.
- Place outside cans as far from your home as possible. Houseflies don’t travel very far – simply placing your cans farther from your home may prevent them from coming inside.
- Straw is a major breeding ground for houseflies, especially if it’s wet. Don’t use it for bedding, animal feed, or fertilizer, if you can help it.
Proper window and door screens go a long way in keeping unwanted fly guests from coming in. All screens should be the right size for the window or door so there are no exposed spaces. And of course, the screen shouldn’t have any holes. Remember, flies are only ¼” long!
How to get rid of houseflies
You hear a familiar and constant buzzing. You see small black dots in the corner of your bedroom ceiling. You are afraid to open the lid to your trashcan. It’s all too clear. You have a house fly infestation.
Here are some ways to get rid of them:
Traps: Fly traps are a relatively inexpensive and popular way to get rid of houseflies. Using the right trap and putting them in the right places is key to their success.
If you do use traps, keep the following in mind:
- White surfaces and fragrant materials attract flies. Sugar, fruit, meat, and molasses all make flies come buzzing. Bating traps with these ingredients may increase their effectiveness.
- Ultraviolet light traps are a popular way to get rid of flies. They either collect flies in a cone with a sticky strip (popular in restaurants) or electrocute the flies (gruesome but effective.)
- Place them inside AND outside. This ensures total fly elimination (muhahaha.) Indoors, place one for every 30 feet of wall space but not within 5 feet of food preparation areas. Outdoors, place them near entrances to buildings, in alleyways, beneath trees, or near animal dwellings.
Sticky fly paper is useful for a small infestation in a concealed area.
And of course, the classic and economical fly swatter is always a great option for the occasional straggler.

Chemical methods should be a last resort. The University of California: Davis points out that infestations are rare when proper sanitation methods are employed. But if all else fails, an aerosol insecticide can be a last resort. But we all know that insecticides can be dangerous, especially for children and pets.
Try EcoSMART
If you decide to use insecticide to get rid of houseflies, why not do it safely and organically? EcoSMART’s Flying Insect Killer is an environmentally-friendly solution to your fly problem. And you can safely use EcoSMART’s Flying Insect Killer around children and pets! Try EcoSMART to get rid of flies, all flying insects, and all other pests!




12 Comments | The First 1,000 to Comment (Starting 12/21/2009) Will Become EcoSMART Product Testers!
By Maggie Slone on Aug 3, 2009
we have a small fruit fly infestation, will this product work?
By Maria Mattos on Aug 8, 2009
We have a new puppy and eventhough we pick up the poop Immediately after going, we have neighbors with dogs who don’t. We have SO many flies it is gross. The lawn has them all over it. How can we effectivley kill the 4 stages of the fly on the lawn to make it fun for my kids to play on again. (I already suggested getting rid of the puppy, and no one agrees.)
By Stefanie Schmidt on Aug 9, 2009
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By Jack Roque on Aug 27, 2009
Looking for natural means to control housefly infestation, at all stages of fly lifecycle.
By Helen on Oct 24, 2009
We get houseflies all the time. I don’t know what to do anymore. I don’t like using pesticides as I worry about the hazards of those. I would love to try an all natural product to get rid of the flies.
By Paul Ott on Oct 24, 2009
have a new roommate that has moved in with a cat and two dogs. Roommate is probably the culprit, but have had a problem with flies in the house since he moved in. Would like to try something that is safe, yet effective against flies and gnats
By angel stout on Oct 25, 2009
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By norma on Oct 25, 2009
It seems no matter what time of the day you open the door a huge fly manages to find it’s way in. They have got bigger & faster I think.
By Lyn on Oct 25, 2009
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By Shannon on Oct 26, 2009
I love to leave the doors open when it’s nice out – but every time I do – I get a house or office full of flies!
I need something that would be safe for anyone entering my house or office (without having to survey for allergies before they enter) and my dog and family, too.
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By Daryl on Feb 26, 2011
I’ve hung up over 30 fly-tape traps in the past year and they definitely do not work. All they do is catch the live flies, eggs are already laid and the new flies continue to multiply. I would never recommend them. EcoSMART sounds like the best option.