Research source: UF/IFAS Featured Creatures: Biting Midges — University of Florida Institute of Food and Agricultural Sciences
No-see-ums — scientifically Culicoides species — are tiny biting midges roughly 1–3 mm in size, making them nearly invisible to the naked eye. They are often worse than mosquitoes in South Florida coastal communities because they are too small to see and can pass through standard window screening. Their bite produces an intense, disproportionately large welt that itches for days.
How to Identify No-See-Ums (Biting Midges)
Breeding & Habitat
Breed in moist, organically rich soil and mud at the edges of mangroves, salt marshes, freshwater swamps, and tidal flats. Unlike mosquitoes, they do not breed in open standing water — they need wet, muddy substrate. This makes breeding site elimination largely impractical for homeowners.
Why This Species Is a Problem in South Florida
South Florida's Intracoastal communities, coastal neighborhoods, and any area near mangroves or salt marsh are prime no-see-um territory. Lauderdale-by-the-Sea, Deerfield Beach, Lighthouse Point, and coastal Boca Raton communities frequently report no-see-ums as more problematic than mosquitoes. Wind is the primary natural deterrent — calm evenings during rainy season are the worst.
Health Risk
Generally not disease vectors in the United States (unlike in some tropical regions)
How We Control No-See-Ums (Biting Midges)
Professional barrier spray using products specifically effective against Culicoides reduces adults resting in vegetation. Because no-see-ums are smaller than mosquitoes and breed in areas that cannot be treated, spray frequency matters — weekly or biweekly service maintains suppression better than monthly. Outdoor fans on patios are an effective mechanical deterrent on calm evenings.
University of Florida Research
For the complete peer-reviewed species profile, lifecycle details, and distribution maps, see the UF/IFAS Featured Creatures database:
UF/IFAS Featured Creatures: Biting Midges ↗Dealing with No-See-Ums (Biting Midges) in South Florida?
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