In 2025, confirmed West Nile virus cases were reported across 45 U.S. states. 

 

Warming temperatures in 2026 are allowing mosquitoes to be active for longer periods — well into fall and winter in some regions. Taking control of your yard’s mosquito population isn’t optional; it’s a health imperative. 

 

Mosquito biology — the key to control: Female mosquitoes lay eggs in standing water. Eggs hatch into larvae within 24–48 hours and develop into adults within 7–14 days. This lifecycle means that eliminating standing water breaks the reproductive cycle before you ever need to spray. 

 

Audit your property for standing water: 

 

Flower pots, saucers, and plant trays· 

Bird baths (change water every 3–4 days)· 

Gutters clogged with debris· 

Tarps and pool covers with depressions· 

Children’s toys, buckets, and wheelbarrows left outside· 

Low-lying areas of the lawn that hold water after rain.

 

Natural mosquito prevention: 

 

Bacillus thuringiensis israelensis (Bti) — sold as “mosquito dunks” — is a naturally occurring bacterium that kills mosquito larvae in standing water. Drop one in ornamental ponds, rain barrels, or any water source you can’t drain. It’s safe for fish, birds, pets, and beneficial 

insects. 

 

Planting natural repellents: Citronella, lemon balm, basil, lavender, and marigolds all produce scents that mosquitoes avoid. Plant them around patios and seating areas. 

 

Yard treatment: A barrier spray of pyrethrin (a plant-derived insecticide) applied to shrubs, tall grass, and shaded areas reduces resting adult mosquitoes significantly. These areas harbor mosquitoes during daylight hours. 

 

Reapply after rain. 

 

Personal protection: DEET-based repellents (20–30% concentration) remain the gold standard for personal use. Picaridin is an equally effective, less irritating alternative. Apply to exposed skin and clothing before spending time outdoors at dusk or dawn — peak mosquito feeding hours.