Mosquito Life Cycle and Breeding Sites: A South Florida Checklist

Most mosquitoes biting you in the backyard didn't fly in from the Everglades. Many of them hatched close by, often on your property or a neighbor's, in water you might never notice. Understanding the life cycle shows why a weekly walk around the yard makes such a difference.

The Four Stages

1. Egg. Container-breeding mosquitoes, like the yellow fever mosquito and the Asian tiger mosquito, lay eggs on the inside walls of containers just above the waterline. Those eggs can survive drying out and hatch when rain refills the container. The southern house mosquito lays floating egg rafts directly on still, often dirty water.

2. Larva. Larvae, often called "wigglers," live in the water and come to the surface to breathe. They feed on tiny bits of organic matter.

3. Pupa. Pupae, or "tumblers," don't feed. They're the transition stage before adulthood and still live in the water.

4. Adult. Adults emerge from the water, rest nearby while their bodies harden, and then mate. Females need a blood meal to develop eggs, which is why only females bite. Males feed on nectar.

In warm weather, the trip from egg to adult can take about a week, sometimes less. In South Florida's summer, that means a bucket that fills on Monday could be producing mosquitoes by the following week.

South Florida Standing-Water Checklist

Walk your yard at least once a week, and after every heavy rain. Tip, toss, cover or flush:

Plants and landscaping

• Plant saucers and decorative pots
• Bromeliads (flush the center cups with a hose)
• Tree holes and rot pockets
• Low spots in the lawn or beds that hold puddles

Roof and drainage

• Gutters and downspouts (clear leaves so water flows)
• Flat roof sections and drain scuppers
• A/C condensate drain lines and the puddles under them
• Yard drains and catch basins on your property

Pools and water features

• Pool covers (drain standing water on top)
• Unused or green pools (keep the pump running and the chemistry balanced)
• Fountains and birdbaths (change the water at least weekly)
• Hot tub covers

Stuff in the yard

• Buckets, watering cans and wheelbarrows
• Kids' toys, sandbox lids and play sets with hollow parts
• Tarps and grill covers that sag and pool water
• Boats, kayaks and boat covers
• Old tires and tire swings (drill drainage holes)
• Recycling bins and trash can lids
• Pet water bowls (refresh daily)

Hurricane season extras

• Stored shutters and storm panels
• Debris piles after storms
• Generator covers and fuel can caps

Hidden Breeding Spots and Larval Traps

Even after a careful walk-through, some breeding water stays hidden: tree holes, bromeliad bases, gaps in pavers, plant debris. Container-breeding mosquitoes like the yellow fever and Asian tiger mosquitoes lay eggs in several places, which larval traps use to their advantage. A female visiting a trap picks up a growth regulator and can carry it to other nearby water, helping keep larvae there from becoming adults. Traps don't replace your weekly standing-water check. The two work together.