Wise House Pest Control company logo featuring an owl inside a house design
(561)-727-8239
Wise House Pest Control company logo featuring an owl inside a house design
(561)-727-8239
Wise House Pest Control company logo featuring an owl inside a house design

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Mosquitoes vs. No-See-Ums in South Florida: What Is Actually Biting You

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You are sitting on the lanai at dusk. Something bites your ankle. You slap. You look. Nothing there.

Ten minutes later, you have a dozen angry red welts across both ankles and the tops of your feet, and you still have not seen a single insect. You go inside, convinced it was mosquitoes, and make a mental note to call a pest control company about mosquito treatment.

Except those were not mosquitoes.

If the bites showed up in clusters, targeted your ankles and feet, felt sharp and burning at the moment of the bite, and the insect was invisible or nearly so, you were bitten by no-see-ums. They are a completely different pest from mosquitoes, they respond to different treatment, and most South Florida homeowners cannot tell the two apart.

The quick read

Mosquitoes and no-see-ums are both biting insects common across Palm Beach County and the Treasure Coast, but they are entirely different species requiring different control approaches.

Mosquitoes are visible, fly with an audible buzz, leave single raised welts that itch for one to three days, and breed in standing water containers on residential property.

No-see-ums (biting midges, genus Culicoides) are nearly invisible to the naked eye, bite in clusters on exposed skin near ground level, leave burning welts that can itch intensely for a week or more, and breed in wet organic soil and shoreline mud.

Mosquito barrier treatments do not effectively control no-see-ums because the two species have different breeding habitats and resting behavior. Identifying which insect is biting you is the first step toward the right solution.

What mosquitoes look like and how they bite

Most South Florida homeowners know what a mosquito looks like. Slender, long-legged, visible to the naked eye, with an audible high-pitched buzz during flight. Adults range from a quarter inch to half an inch in body length depending on species. The bite pattern is distinctive. Mosquitoes land individually on exposed skin, typically targeting larger surfaces like arms, legs, and the back of the neck. Each bite produces a single raised welt that develops within minutes and itches for one to three days before resolving. UF/IFAS documents the primary biting mosquito species in South Florida as Aedes aegypti, Aedes albopictus, Culex quinquefasciatus, and Culex nigripalpus, all of which breed in standing water and are targetable through container elimination and barrier treatment. Mosquito activity peaks at dawn and dusk, with some Aedes species (particularly the Asian tiger mosquito) biting during full daylight.

What no-see-ums actually are

No-see-ums are biting midges in the genus Culicoides. The common names vary by region. In South Florida, they are called no-see-ums. In other parts of Florida and the South, they are called sand gnats, sand flies, or punkies. They are not related to mosquitoes, gnats, or sand flies despite the overlapping common names. Adult no-see-ums are tiny. Body length is roughly one to three millimeters, small enough to pass through standard window and door screens. Their wings are patterned when magnified but essentially invisible at normal viewing distance. The insect itself is nearly impossible to see on skin before or during the bite. UF/IFAS identifies Culicoides furens as the most common biting midge species in coastal South Florida, with peak activity in spring through fall and breeding habitat concentrated in wet organic soils, mangrove margins, and salt marsh edges.

The bite pattern is the giveaway. No-see-ums bite in clusters rather than individually. Multiple bites appear together on exposed skin near ground level, with ankles, feet, wrists, and the backs of hands being the most common targets. The bite itself is sharp and burning, disproportionate to the size of the insect. The resulting welts are small, intensely itchy, and can persist for a week or longer.

How to tell which one is biting you

Five differences separate mosquito bites from no-see-um bites consistently enough to identify the culprit without seeing the insect.

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Bite pattern.

Mosquito bites are individual, scattered across larger skin surfaces. No-see-um bites appear in clusters on exposed skin near ground level.

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Bite sensation.

Mosquito bites often go unnoticed at the moment of the bite. No-see-um bites produce an immediate sharp, burning sensation.

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Welt appearance.

Mosquito welts are raised, round, and develop within minutes. No-see-um welts are smaller, often appearing as red dots initially, with intense itching developing over the following hours.

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Duration.

Mosquito bites typically resolve in one to three days. No-see-um bites can itch intensely for five to ten days and sometimes leave small marks for weeks.

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Visibility of the insect.

Mosquitoes are visible and audible. No-see-ums are essentially invisible during the bite, which is how the species got its name.

If you went inside covered in bites you never saw coming, concentrated on your ankles and feet, with a burning itch that lasted well into the following week, those were no-see-ums.

Where each species breeds in South Florida

The breeding habitats are completely different, which is why treatment approaches differ. Mosquitoes breed in standing water. Planter saucers, clogged gutters, birdbaths, pool equipment cavities, unused tires, and any container holding water for more than a few days. The breeding sites are on your property and largely within your control. Eliminating standing water and applying barrier treatment to resting vegetation are the foundations of effective mosquito control.

No-see-ums breed in wet organic soil. Salt marsh edges, mangrove margins, mudflats, wet leaf litter, and the shoreline mud along canals, rivers, and the Intracoastal Waterway. These breeding sites are environmental, not residential. You cannot eliminate them by managing your property.

This distinction matters enormously for homeowners in Boca Raton, Boynton Beach, Lantana, Port St. Lucie, Stuart, and Palm City. Properties near the Intracoastal, along canal systems, or adjacent to preserved wetlands experience no-see-um pressure that has nothing to do with conditions on the property itself. Mosquito treatment applied to the yard does not address no-see-um breeding happening in the wetland a quarter mile away.

Why mosquito treatment does not solve a no-see-um problem

Standard mosquito barrier treatment targets the vegetation where adult mosquitoes rest during the day. The product is applied to shrubs, ground cover, and ornamental vegetation around the structure. Adult mosquitoes resting on those surfaces contact the product and die.

No-see-ums do not rest on vegetation the same way. Their resting behavior is different, their flight patterns are different, and their breeding habitat is not on your property. A mosquito barrier treatment may reduce the number of no-see-ums that happen to contact treated surfaces, but it does not address the source population or provide the same level of reduction you would expect for mosquitoes.

Effective no-see-um reduction for South Florida homeowners is built around physical exclusion rather than chemical treatment. Finer mesh screening on lanais and porches is the most reliable protection. Standard window screen mesh has openings large enough for no-see-ums to pass through. No-see-um rated screening (typically 20×20 mesh or finer) blocks the species effectively.

Fans are also effective. No-see-ums are weak fliers, and even moderate air movement from a patio fan disrupts their ability to land and bite.

Timing matters too. No-see-um activity peaks at dawn and dusk, particularly on calm, humid evenings with low wind. Avoiding unscreened outdoor activity during those windows on properties near the Intracoastal or wetland areas is the most practical behavioral adjustment.

What works for each species

For mosquitoes, the approach most Palm Beach County and Treasure Coast homeowners know works well. Eliminate standing water on the property. Apply professional barrier treatment to resting vegetation. Maintain screens. Schedule ongoing treatment through rainy season.

For no-see-ums, the approach is different. Install no-see-um rated screening on lanais, porches, and any outdoor living spaces you use at dawn and dusk. Use fans to create air movement in outdoor seating areas. Avoid unscreened outdoor activity during peak no-see-um hours on calm evenings, particularly near the Intracoastal or canal systems. Wear long sleeves and use DEET-based repellent on exposed skin when outdoors during peak hours.

For properties experiencing both species simultaneously, the combination of professional mosquito barrier treatment and physical no-see-um exclusion produces the best results.

Call Wise House Pest Control

At Wise House Pest Control, we treat mosquito activity across Palm Beach County and the Treasure Coast through barrier treatment programs that run from spring through the end of rainy season. When a homeowner calls about bites and we discover the problem is no-see-ums rather than mosquitoes, we say so. The honest answer saves the homeowner money and frustration, because applying mosquito treatment to a no-see-um problem does not solve it.

If you are getting bitten on your property and you are not sure what is doing the biting, we will identify the species and recommend the approach that actually works for your situation.

We Have Two Convenient Locations:

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Lantana Office

1177 Hypoluxo Rd Suite C-31 Lantana, FL 33462 (561) 727-8239

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Port St Lucie Office

464 NW Peacock Blvd, Unit 106 Port St Lucie, FL 34986 (772) 783-4300

Sources:

UF/IFAS EDIS publication — mosquito species, biology, and residential control in Florida
UF/IFAS EDIS publication — biting midges (no-see-ums) in Florida, species identification, and management
CDC — mosquito species carrying disease in the United States

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Frequently Asked Questions

Mosquito bites are individual, scattered, and resolve in one to three days. No-see-um bites appear in clusters on ankles and feet, burn at the moment of the bite, and itch intensely for a week or more.
Mosquito barrier treatment may kill some no-see-ums that contact treated surfaces, but it does not address the source population because no-see-ums breed in wet organic soil offsite rather than in standing water on your property.
Yes. Standard window and door screens have openings large enough for no-see-ums to pass through. No-see-um rated screening (20×20 mesh or finer) is required to block them.
No-see-ums breed in salt marsh edges, mangrove margins, and wet organic soils concentrated along waterways. Properties near the Intracoastal in Boca Raton, Boynton Beach, Stuart, and Palm City experience heavier pressure because of proximity to breeding habitat.
Peak activity occurs at dawn and dusk on calm, humid evenings with low wind. Spring through fall is the active season, with highest pressure during rainy season months.