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Mosquito

Yellow Fever Mosquito

Aedes aegypti

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Research source: UF/IFAS Featured Creatures: Aedes aegypti — University of Florida Institute of Food and Agricultural Sciences

Aedes aegypti is the most dangerous mosquito in South Florida. A small, dark species with distinctive white lyre-shaped markings on its thorax, it is the primary vector of dengue fever, Zika virus, chikungunya, and yellow fever in Florida. Unlike most mosquitoes, it bites aggressively during the day.

How to Identify Yellow Fever Mosquito

Characteristic Detail
Size 4–7 mm (smaller than a typical house mosquito)
Color Dark brown to black with white markings
Key marking White lyre-shaped pattern on the upper thorax — the definitive ID mark
Legs Banded white and black
Biting behavior Day-biter — most active 2 hours after sunrise and 2 hours before sunset
Flight range Short — typically stays within 200 meters of breeding site

Breeding & Habitat

Breeds exclusively in standing water in artificial containers: flower pots, buckets, bottle caps, bird baths, clogged gutters, and tarps. As little as a bottle cap of water is sufficient. Does not breed in natural water bodies like lakes or canals.

Why This Species Is a Problem in South Florida

South Florida's warm climate allows Aedes aegypti to be active year-round. Dense residential landscaping and frequent rainfall create constant breeding pressure. Broward and Palm Beach Counties have documented locally-transmitted dengue cases linked to this species.

Health Risk

Dengue fever, Zika virus, chikungunya, yellow fever

How We Control Yellow Fever Mosquito

Source reduction (eliminating containers) is essential but not sufficient in dense residential areas. Professional barrier spray targets resting adults in vegetation. Because Ae. aegypti rests low in shrubs and ground cover rather than tree canopy, application technique matters — we treat within 3 feet of the ground where this species hides.

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: Aedes aegypti ↗

Dealing with Yellow Fever Mosquito in South Florida?

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