Biting pests
Mosquito source reduction
Adult fogging is theater if the yard still holds water. Aedes mosquitoes that transmit some viruses in the US breed in teaspoons of water: gutters, saucers, tarps, and toys. Culex mosquitoes, involved in West Nile virus cycles, breed in richer standing water. CDC’s first message is still dump, drain, and screen.
When this method is the right tool
Use source reduction from spring thaw through first hard freeze in most of the US, year-round in southern Florida, Hawaii, and parts of the Gulf Coast. Combine with screens and, when needed, EPA-registered repellents on skin.
How to do it
- Walk for water weekly. Gutters, bird baths, corrugated downspouts, plant saucers, spare tires, and trailer frames.
- Repair screens and door sweeps. The cheapest adulticide is a tight house.
- Treat water you cannot dump. Use labeled larvicides (for example, Bti dunks) in rain barrels and ornamental ponds as the label allows. Do not oil a pond into an ecological mess.
- Personal protection. EPA-registered repellents, long sleeves at dusk, and dumping water beat a backyard fogger for family protection.
Tools this method is written for
Dump, screen, then Bti in water that has to stay. Repellent is personal protection, not source reduction.
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Labeled product
Mosquito Dunks (Bti larvicide)
Treat standing water you cannot dump: birdbaths, gutters, unused pools, rain barrels. Bti hits larvae. A backyard fogger does not replace emptying the saucer under a pot.
Hardware
Window screen repair kit
A torn screen is a mosquito and fly door. Patch or respline. Attic vents still need hardware cloth, not fiberglass, if rodents are the pressure.
Labeled product
EPA-registered insect repellent
DEET or picaridin on skin as the label allows, plus a shower and a full-body check. A yard spray is not a hike protocol. Tweezers still belong in the kit.
Mistakes that waste money
- Ultrasonic yard gadgets sold as mosquito control.
- Leaving a pool cover sagging with rain.
- Fogging at noon when many mosquitoes are not flying.
Safety
Follow repellent labels, especially on children. CDC and EPA jointly list which active ingredients are registered. Do not put DEET on infants except as a clinician or label allows.