10/27/2026
Emptied every bucket and still getting swarmed? In Florida, not every mosquito needs a backyard container. One example is the saltmarsh mosquito.
UF/IFAS explains that black saltmarsh mosquitoes lay their eggs on moist soil in marshes and mangroves — not on open water.
Collier Mosquito Control District notes those eggs can wait months, sometimes years, then hatch all at once when high tides or heavy rain flood the marsh. Larvae develop in about 5–15 days, and wind can carry adults up to 40 miles from where they hatched.
Indian River Mosquito Control District describes a single tide or rain event producing billions of mosquitoes.
What you can do when swarms hit:
• Use an EPA-registered repellent (DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD, or 2-undecanone), per the CDC.
• Patch holes in window and door screens.
• Report heavy biting to your county mosquito control district — they track and treat marsh broods.
• Keep doing your weekly yard walk for the container mosquitoes that breed at home.
The common DIY pitfall: assuming a dry yard means no mosquitoes. Saltmarsh broods can arrive from miles away.
ABC's Florida mosquito service targets resting and breeding areas around your home. Let's make your yard more comfortable.