Key takeaways
- Removing breeding sites beats every repellent: UF/IFAS says killing adult flies is not enough unless breeding areas are eliminated.
- In warm weather, house flies go from egg to adult in 7 to 10 days, and one female lays up to 500 eggs.
- A fly swatter, intact screens and tight trash lids beat folk fixes like a bag of water with a penny, which Mississippi State Extension says just don't work.
- Plants like basil and sprays made with essential oils have no solid evidence of keeping flies out of a home.
In this article
The home remedies that really keep flies at bay are the unglamorous ones: tight lids on the trash, quick cleanup of food and pet waste, intact screens, closed doors, a fly swatter and simple bait traps. Herbs, essential oil sprays, cloves and cucumber slices are popular, but there is little or no evidence that they keep flies out of a home.
The reason is biology. Flies show up where they can feed and lay eggs, and in South Florida’s heat they multiply fast. A remedy that does not remove what attracts them, or physically keep them out, will not stop the next generation. Below you will find the remedies that work, an honest look at the popular tricks and a plan for finding where your flies are coming from.
Why Flies Thrive in South Florida Homes
The house fly is the fly most people battle at home, and warm weather is its friend. According to UF/IFAS, the house fly’s life cycle can take as little as 7 to 10 days under warm conditions, and subtropical and tropical regions see more than 20 generations a year. A single female can lay up to 500 eggs in batches of 75 to 150.
House flies breed in moist, decaying organic matter: kitchen waste, fermenting fruit and vegetables, garbage, manure and pet waste. In South Florida, the long rainy season keeps that material wet, and heat speeds up both decay and fly development. Adults usually live 15 to 25 days, but without food they survive only two to three days, which is one more reason sanitation works so well.
Why Flies Are More Than a Nuisance
House flies do not bite, but they are not harmless. UF/IFAS explains that flies pick up pathogens from garbage, sewage and other filth and transfer them to food through their mouthparts, vomit, feces and contaminated body parts. Some pathogens survive in the fly’s mouthparts or gut for several days.
The bacteria linked to house flies include Salmonella, Shigella, Campylobacter and Escherichia, and the illnesses associated with them include diarrhea, food poisoning, dysentery and typhoid fever. Food that is eaten uncooked is the biggest concern. For a restaurant or any food business, flies are also an inspection problem, not just an annoyance.
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Home Remedies That Actually Keep Flies Away
These methods are backed by extension research, cost little and work in any home.
1. Take Away the Breeding Sites
UF/IFAS is blunt: killing adult flies may reduce an infestation, but eliminating breeding areas is necessary.
- Use trash cans with tight-fitting lids, inside and outside, and keep outdoor cans away from doors.
- Seal food waste in plastic bags before it goes in the bin, as Mississippi State University Extension recommends.
- Pick up pet waste promptly; NC State notes blow flies can lay hundreds of eggs on dog droppings.
- Rinse cans, bottles and food containers before they go into recycling.
- Do not let dirty dishes and food scraps sit in the sink.
- Take out kitchen trash daily during hot months.
2. Keep Them Out
Mississippi State Extension notes that flies get into homes mainly when doors and windows are opened. Keep doors closed, fix torn window screens before opening windows, and add door sweeps where you can see daylight underneath.
3. Swat and Trap the Ones Inside
Once flies are indoors, Mississippi State Extension ranks a flyswatter or an ultraviolet light trap among the best control methods. UF/IFAS adds two placement rules for light traps: put them near entryways, since flies do not orient to traps from far away, and never within about five feet of food preparation areas.
4. Use a Simple Bait Trap
UF/IFAS notes that fly traps can be baited with sugar, molasses, fruit or meat. A jar or bottle trap with a little sugar water or overripe fruit, placed away from where you eat, can catch flies that slip past your screens. For tiny flies around fruit, an apple cider vinegar trap with a drop of dish soap is the classic choice; see how to remove fruit flies from your home for the setup.
Popular Fly Remedies, Checked Against the Evidence
Many lists of fly remedies repeat the same ideas. Here is how they hold up.
| Remedy | Claim | What the evidence shows | Verdict |
|---|---|---|---|
| Basil, marigold, lavender or mint plants | Repel flies from the house | No research shows potted herbs keep flies out of a home | Enjoy them as plants, not protection |
| Essential oil sprays (peppermint, lemongrass, eucalyptus) | Keep rooms fly-free | No extension research shows they keep a home fly-free | Unreliable |
| Cloves, cinnamon or cucumber slices | Flies avoid the smell | No supporting research | Skip |
| Burning camphor | Fumes drive flies out | No supporting research; burning anything indoors adds smoke and fire risk | Avoid |
| Bag of water with a penny | Flies fear their reflection | Mississippi State Extension says these fixes just don’t work | Skip |
| Vinegar or wine trap with dish soap | Catches flies | Works mainly for fruit flies, and only for adults already present | Helpful extra |
| Sugar or fruit bait trap | Catches house flies | Traps baited with sugar or fruit are used in fly control (UF/IFAS) | Helpful extra |
| Sanitation, screens and swatter | Prevent and remove flies | Recommended by UF/IFAS and Mississippi State Extension | Works |
Why “Natural” Fly Sprays Deserve a Second Look
Many plant-oil sprays are sold as “minimum risk” pesticides, a category the EPA exempts from regulation under federal pesticide law when a product meets six conditions, including using only ingredients on its approved lists. That exemption is not a stamp of effectiveness. The EPA states plainly that it does not review exempted products, which means the agency has not checked whether a given spray actually controls flies. Treat any fly spray, natural or not, as a short-term knockdown for adults, and follow the label.
Find Out Which Flies You Have
The right remedy depends on the fly, because each one breeds somewhere different.
- House flies: gray with dark stripes, around garbage and food. Fix trash and pet waste first.
- Blow flies: large, shiny green or blue. NC State Extension notes that a sudden indoor emergence is often linked to a dead animal in a wall void, crawl space or attic, so look for a source and an odor.
- Fruit flies and drain flies: tiny flies around fruit, trash, sinks and showers. They breed in fermenting food and the slimy film inside drains.
- Cluster flies: sluggish flies at windows in colder regions, which shelter in walls for the winter. Learn the signs in how to get rid of cluster flies in your house.
Our fly library has photos and details on the species most common in South Florida.
A Weekly Fly-Prevention Routine
| How often | What to do |
|---|---|
| Daily | Take out kitchen trash in hot weather, wash dishes, wipe counters, pick up pet waste |
| Twice a week | Rinse indoor and outdoor trash cans if they smell; empty and rinse pet food bowls |
| Weekly | Rinse recycling bins, check fruit and vegetable storage for anything spoiling, flush and scrub kitchen and bathroom drains |
| Monthly | Inspect window and door screens and door sweeps; clean behind the fridge and stove |
| After storms | Clear wet yard debris and spilled garbage, and check for animals that may have died near the house |
When Home Remedies Aren’t Enough
If flies keep coming back after you have cleaned up the obvious sources, they are breeding somewhere you have not found yet. That is often a drain, a wall void or a commercial-size waste area. Toro’s drain cleaning service treats drain fly and fruit fly breeding sites with Bio-Foam, whose microbes digest the buildup the flies live on. For restaurants, bars and other food businesses, Toro’s food service pest control program targets flies breeding in floor drains and the waste and gaps that draw them.
For homes, the residential pest control plan covers the inside and outside every other month. Toro has protected South Florida since 1969, inspections are free, and your first service is $25 off.
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305-594-4767Frequently Asked Questions
What smell do flies hate the most?
Does a bag of water with a penny keep flies away?
How do I keep flies away from my patio or outdoor party?
Why are there flies in my house when it is clean?
Are fly baits safe to use around pets?
Sources
- House fly, Musca domestica Linnaeus (Insecta: Diptera: Muscidae), UF/IFAS Extension
- How to Control Flies in Your Home, Mississippi State University Extension
- Blow Fly Biology & Management, NC State Extension
- Conditions for Minimum Risk Pesticides, US Environmental Protection Agency
Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.
