How to Get Rid of Midges in Florida: Inside and Out

Florida’s midge problem splits into two distinct pests that demand different strategies: biting midges (the tiny Culicoides species locals call “no-see-ums” or “sand gnats”) and non-biting chironomid midges that swarm near lakes and wetlands in clouds thick enough to coat walls and clog air filters. Getting rid of either type requires a combination of physical barriers, habitat management, and targeted repellents or treatments rather than any single fix. The approach changes depending on whether you’re dealing with the ones that bite or the ones that just show up in staggering numbers.

Biting Midges Versus Non-Biting Midges

Before spending money on traps or treatments, figure out which midge you’re dealing with. Biting midges in Florida are almost always Culicoides species, tiny flies barely one to three millimeters long that slip through standard window screens and leave intensely itchy welts. They breed in moist soil, salt marshes, mangrove mud, tree holes, and the edges of ponds. Coastal counties and areas near the Everglades tend to get hammered hardest, but they turn up across the state wherever there’s damp organic matter.

Non-biting chironomid midges look like small mosquitoes and often get mistaken for them. They don’t bite, don’t transmit disease to humans, and are technically harmless, but they breed in enormous numbers in Florida’s nutrient-rich lakes and retention ponds. Research on Central Florida lakes found that water depth, sediment type, and whether the bottom was sand, muck, or vegetation were the primary drivers of where chironomid larvae concentrated.¹ Lakes with high nutrient loads (the ones that look green and murky) produce the worst swarms. If you live on or near one of these lakes, you already know the drill: clouds of midges at dusk covering your lanai screens, attracted to every light on the property.

The strategies below address both types, and they’re labeled where a tactic works better for one than the other.

Sealing Your Home Against Midges

Standard fiberglass window screens have a mesh size that stops mosquitoes but lets the smallest biting midges walk right through. If no-see-ums are your problem, you need finer mesh. Screens marketed as “no-see-um mesh” or 20×20 mesh per inch (roughly 0.6 mm openings) block them effectively. The trade-off is reduced airflow and slightly dimmer visibility through the screen, but in heavily infested coastal areas of Florida, it’s a necessary upgrade for any window or door you plan to leave open.

For non-biting chironomids, standard screens work fine since the adults are larger. The real issue is that they pile up on screen surfaces, drawn by interior lighting, and find gaps around screen-door frames, torn mesh, or poorly sealed lanai enclosures. Walk the perimeter of your screens with a flashlight at night during peak season and patch or replace any section where you see midges collecting on the inside.

Other indoor measures that help against both types:

Reduce visible light: Switch exterior lights near doors to yellow or amber LED bulbs, which attract fewer flying insects than white or blue-white light. Draw blinds or curtains on windows facing water or marshland at dusk.
Positive air pressure: Running your air conditioning keeps indoor pressure slightly higher than outdoor pressure, which pushes air out through cracks rather than drawing insects in. Homes that rely on open windows in the evenings will always have more midge intrusion than sealed, air-conditioned homes.
Ceiling fans and air movement: Midges are weak fliers. A ceiling fan on a covered porch or inside a lanai creates enough wind to keep them away from you, even if they’ve already made it past the screens.

Ceiling fans are especially effective for no-see-ums, which weigh almost nothing and can’t fly in anything more than a light breeze. A box fan pointed outward at a doorway acts as a simple air curtain when you’re moving in and out.

Outdoor Strategies for Your Yard

Eliminating midges from an entire outdoor area in Florida is, frankly, unrealistic. You can’t drain a marsh or sterilize a lake. But you can reduce their numbers in the immediate zone around your home and make your outdoor spaces much more comfortable.

For biting midges, focus on removing their breeding habitat on your property. Culicoides larvae develop in moist organic material: overwatered flower beds, clogged gutters, tree holes filled with decaying leaves, poorly drained low spots in the yard, and the edges of ornamental ponds. Improving drainage, keeping mulch beds from staying perpetually soggy, cleaning gutters regularly, and filling or draining standing water all chip away at the local population. This won’t eliminate midges blowing in from nearby salt marshes or mangrove areas, but it reduces the ones breeding on your turf.

For non-biting chironomid midges near lakes, the breeding site is the lake itself, and you have no realistic way to treat it on your own. Your main outdoor tools are managing light and creating wind barriers. Keeping lakeside exterior lights off or switching them to warm amber dramatically reduces the swarms that gather on your house at night. Some homeowners install a sacrificial bright white light at the far edge of their property to draw midges away from the house, though the evidence for this is anecdotal.

Repellents That Work on No-See-Ums

DEET is the go-to insect repellent in the United States, and it does provide some protection against Culicoides biting midges. But it’s not the best option. A review of chemical and plant-based repellents found that products containing IR3535, picaridin, or oil of lemon eucalyptus (the active ingredient is p-menthane-3,8-diol, often abbreviated PMD) offered better topical protection against biting midges than DEET alone.²

Picaridin-based repellents (sold under brand names like Sawyer and Natrapel in the U.S.) have the added advantage of not damaging plastics or synthetic fabrics the way DEET can. For anyone spending extended time outdoors in coastal Florida during midge season, a picaridin or PMD-based product applied to exposed skin is probably your strongest personal defense. Reapply per the label instructions, especially if you’re sweating, since Florida’s humidity works against repellent longevity.

Permethrin-treated clothing adds a second layer of protection. Spray it on long sleeves, pants, and socks and let it dry before wearing. Permethrin kills or repels midges on contact and survives several wash cycles. Combining permethrin-treated clothing with a skin-applied repellent gives you the best odds of a bite-free evening outdoors.

Traps and Light Management

Commercial insect traps marketed for midges fall into a few categories, and their effectiveness varies. UV light traps have been shown to catch the widest range of Culicoides species in research settings.³ However, trapping midges and meaningfully reducing the population biting you are different things. A study comparing trap catches to actual biting rates on hosts found that UV light traps gave a good picture of which species were present but significantly misestimated how aggressively those species were actually biting.⁴ Carbon dioxide-baited traps, which mimic the breath of a warm-blooded host, actually collected fewer midges overall in the same study.

The practical takeaway: a UV light trap placed away from your seating area can pull some midges out of circulation and is probably worth running during peak season, but don’t expect it to create a midge-free zone. These traps work best as one part of a layered approach alongside repellents, fans, and screening, not as a standalone solution. Propane-powered traps that produce both CO2 and heat are marketed heavily for mosquitoes, and they do catch some midges, but their cost is hard to justify based on the midge-reduction evidence alone.

For non-biting chironomids swarming near lakes, the single most effective outdoor measure is light management. These midges are intensely attracted to white and blue-spectrum light. Replacing white porch lights with warm amber or yellow LED bulbs, turning off unnecessary outdoor lighting during swarm season, and using motion-activated lights instead of always-on fixtures all make a measurable difference in how many midges congregate on your home.

Targeting Larvae Before They Fly

Killing midges as larvae, before they become flying adults, is more efficient than battling adults one evening at a time. The approach depends on the species and habitat.

For biting midges breeding in small, identifiable wet areas on your property, Bacillus thuringiensis israelensis (Bti) is the standard biological larvicide. Bti is a naturally occurring soil bacterium that produces toxins lethal to the larvae of midges, mosquitoes, and black flies when they ingest it. It is considered target-specific and carries low risk of the larvae developing resistance.⁵ You can buy Bti in granule or dunk form at hardware stores and apply it to standing water, wet mulch beds, and drainage ditches on your property. It breaks down in sunlight and needs reapplication every one to four weeks depending on the product.

For chironomid midges breeding in lakes, individual homeowners generally can’t treat the water body. Lake-wide larvicide programs are usually managed by municipalities or HOAs. Chemical larvicides have been used historically in warm-water lakes, but they come with ecological costs. Research on chlorpyrifos use in southern California lakes found that residues accumulated in bottom sediment and in bottom-dwelling fish like channel catfish, reaching levels well above what appeared in the water column.⁶ While residues declined to barely detectable levels within about 25 days, the pattern of bioaccumulation in bottom-feeding fish raises concerns about repeated treatments. Many Florida water management districts have moved toward Bti or growth regulators for lake treatments, though coverage of an entire lake is expensive and temporary.

Why Florida Is Particularly Bad

Florida’s midge problem is worse than in most of the country for reasons that are essentially baked into the geography. The state is flat, low-lying, and saturated with water. Coastal salt marshes, mangrove wetlands, freshwater lakes, retention ponds, canal systems, and soggy yards create continuous breeding habitat for both Culicoides and chironomid species. High year-round humidity keeps soil surfaces moist even between rain events, extending the breeding season well beyond what northern states experience. In much of southern and central Florida, midge season effectively runs year-round with peaks after rainy periods.

Nutrient runoff into Florida’s lakes from agriculture, lawns, and septic systems fuels algae growth, which in turn feeds chironomid larvae. The more eutrophic (nutrient-loaded) a lake becomes, the worse the chironomid swarms. This is why some of Central Florida’s most developed lakeside communities face the worst non-biting midge infestations: the development itself contributes to the nutrient loading that produces the swarms.

Health Risks from Biting Midges

For humans in Florida, no-see-um bites are painful and itchy but generally not dangerous. The primary health concern is secondary infection from scratching. Some people develop outsized allergic reactions to the bites, with welts that last for days and significant swelling, while others barely notice them. There’s no established evidence that Culicoides midges in Florida transmit diseases to humans.

The picture is different for livestock and wildlife. Culicoides midges are established vectors of epizootic hemorrhagic disease virus and bluetongue virus, both of which can be devastating to deer, cattle, and sheep.⁷ Florida deer farms and cattle operations take Culicoides management seriously for this reason, and outbreaks of these viruses in white-tailed deer are a regular occurrence in the state. If you keep livestock, working with your county extension office on a midge management plan is worth the effort.

When Midges Affect Property Values

If you’re considering buying waterfront or near-water property in Florida, midge infestations are worth investigating before closing. Research in a coastal Australian city found that suburbs with severe biting midge problems had significantly lower residential property values, with the estimated reduction running into tens of millions of dollars across affected neighborhoods.⁸ While that study was conducted in Australia rather than Florida, the dynamic is the same: persistent midge problems suppress demand and prices in affected areas, and buyers in Florida’s coastal and lakeside markets encounter the same pattern.

Sellers in midge-prone areas sometimes schedule showings during times of day or seasons when midges are least active. If you’re buying, visit the property at dusk during the warmer months, sit outside for 20 minutes, and see what shows up. Talk to neighbors. Check whether the local mosquito control district includes midge management in its services, as some Florida counties do and some don’t. A property that looks like paradise at noon in February can become miserable at sundown in June if the midge situation isn’t managed.

Managing Expectations

The honest reality of midge control in Florida is that complete elimination is not on the table. You are living in a subtropical wetland ecosystem, and midges are one of its most prolific products. Every control method is partial. Screens keep them out of the house. Repellents protect your skin. Fans keep them off the porch. Bti knocks down larvae in your yard. Light management reduces chironomid swarms on your walls. Layer enough of these together and you can make your property comfortable.

Timing helps too. Biting midges are most active at dawn and dusk, especially on calm, humid evenings. Scheduling outdoor activities for the middle of the day, or for evenings when a breeze is blowing, avoids the worst of it. Even a wind of five to eight miles per hour grounds most Culicoides midges. Non-biting chironomid swarms are heaviest in the first few hours after sunset and taper off later at night. If you can wait until nine or ten in the evening to use your patio near a lake, you’ll often find the swarm has moved on.

The residents who manage best in midge-heavy parts of Florida tend to be the ones who approach it the way they approach hurricane prep or lawn care in sand: as a permanent, manageable feature of the environment rather than a problem that gets solved once and stays solved. Rotate your tactics with the seasons, maintain your screens and drainage, and keep a good repellent by the back door.