Sterile mosquitoes vs misting systems
A misting system runs on a timer. Sterile males control the next generation biologically, safely for everyone.
A mosquito misting system sprays a fine mist of insecticide, usually pyrethrins or permethrin, from nozzles around a yard on a timer. It knocks down mosquitoes near the nozzles while it runs, but the EPA says these systems haven't been studied enough to document their effectiveness, and the American Mosquito Control Association discourages them.¹ ² Sterile male mosquitoes are biological control, safe for people, pets and pollinators: they reduce the next generation, affect only the species released, and leave nothing for rain to wash off. You should start to feel the difference within 7 to 14 days, and it keeps improving from there.
How misting systems work
Nozzles along the fence line, eaves or patio connect to a tank, a pump and a timer.
On a timer, or on demand by remote control, the system sprays a fine mist of insecticide around the yard.² ³ The EPA says the products most often used contain pyrethrins and permethrin, sometimes with piperonyl butoxide added.¹ The tank is refilled with concentrate through the season. AgriLife rates pyrethrins as lasting minutes to hours, which is why the timer has to keep firing, and the EPA advises against running a system in rain at all.¹ ³
The EPA regulates the insecticide but not the equipment, which it treats as application equipment, and state rules vary.¹ Its guidance for owners includes: set timers for when people and pets are unlikely to be sprayed, don't run the system in winds above 10 mph, rain or fog, and keep nozzles away from pools and fish ponds.¹
What the experts say
- The EPA: outdoor residential misting systems "have not yet been studied sufficiently to document their effectiveness in controlling mosquitoes."¹
- The American Mosquito Control Association: timed sprays without surveillance data "may result in needless insecticide applications," and there is "little to demonstrate that these systems actually serve to control mosquito populations."² The AMCA says the systems should be discouraged until they are redesigned around surveillance and proven to work.²
- Texas A&M AgriLife Extension: mister systems are "expensive and controversial," continual use may contribute to insecticide-resistant mosquitoes, and daytime use is likely to harm beneficial insects.³
How sterile males work
Biological control that's precisely targeted: it affects only the two mosquito species we release, so your dog, your cat, the fish pond and the bees are untouched.
There are no nozzles, tanks or timers to maintain. The males find wild females on their own, including in places the mist never reaches, and the local population collapses, generation by generation.
Four steps to fewer mosquitoes
Side by side
How a timed misting system and a season of sterile males compare.
| Compared on | Misting system | Sterile males (SMF) |
|---|---|---|
| What it does | Kills adult mosquitoes the mist reaches | Wild females that mate with them lay eggs that don't hatch, so fewer adults emerge |
| Reaches hidden breeding sites | Only near the nozzles, while it runs | Often. Males find wild females on their own, including in gutters, drains, dense plants and the yard next door |
| How long it lasts | While it runs, near the nozzles; pyrethrins last minutes to hours³; effectiveness not yet documented, per the EPA¹ | Keeps working with every release, generation after generation |
| What rain does to it | EPA: don't run it in rain, fog or winds above 10 mph, so wet evenings are lost¹ | Nothing to wash off, and the next release keeps the program going |
| Bees, butterflies and other insects | Pyrethrins and permethrin "are toxic to all insects," including honeybees, ladybugs and butterflies¹ | Not affected. Males mate only with their own species. |
| Pets, kids and water | EPA: don't spray when people, pets or food are present. Permethrin is very highly toxic to fish.¹ Cats are more sensitive to permethrin than dogs or people.⁴ | Safe for everyone: nothing is applied, and the males don't bite. |
| Drift to neighbors | Can reach people, animals and yards beyond yours¹ | None |
| Resistance | Continual use may breed resistant mosquitoes² ³ | No insecticide is involved |
| Disruption | Nozzles, tubing, tank refills and maintenance | Homes: a release plate twice a month (once a month in winter), about a minute. Commercial: our team or your staff release on site. |
| How you pay | Equipment and installation, then concentrate refills and service | Quoted for your property |
| Right for | On-demand knockdown in a small, defined area | Season-long reduction of the daytime and dusk biters |
When a misting system can make sense
If you already own one, it can still be used carefully. The EPA's guidance points the way.¹
Run it on demand, not on a timer. Switching to manual or sensor-triggered runs, around dawn and dusk when mosquitoes are active, means fewer sprays when no one needs them. The AMCA's core objection is spraying without knowing whether mosquitoes are there.²
Keep it away from people, pets, food and water. Mount nozzles low, under 10 feet, to cut drift, and aim them away from pools, ponds and air intakes.¹
Use it for a small space. A misting system knocks mosquitoes down only where the mist reaches. For a covered patio during a dinner party, that may be enough. For a whole property, it isn't designed to reduce the population breeding nearby.
Using them together
Sterile males and a misting system work against each other if the timer keeps running. A mist that kills wild mosquitoes kills the males we release too.
If you're switching, run the misting system for the last time at least one week before your first release, then turn it off. Once releases start, don't spray or mist. Pair releases with the basics: tip out standing water after rain, and use repellent on your skin on evenings when night biters are out.
For water you can't dump, see larvicides and dunks. For the closest alternatives, see barrier spraying and fogging. For every other option, Compare all options.
FAQ
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Do mosquito misting systems work?
They kill mosquitoes the mist reaches while they run. Whether they reduce mosquitoes over a season is unproven: the EPA says they haven't been studied enough to document their effectiveness, and the AMCA discourages them.¹ ²
Are mosquito misting systems safe for pets?
The EPA says it doesn't expect risks of concern to people when products are used according to their labels, but that pets can be exposed the same way people are, including by direct contact with the spray, so systems shouldn't run when pets are present.¹ Cats are especially sensitive to permethrin.⁴ Fish ponds are a concern too: permethrin is very highly toxic to fish.¹ Sterile males are safe for pets and fish: nothing is applied. See our safety page.
What chemical is used in mosquito misting systems?
Most products contain pyrethrins and permethrin, sometimes with piperonyl butoxide, according to the EPA.¹ Check your system's label: it's illegal to use a pesticide in a misting system if its label prohibits that use.¹
Do misting systems kill bees?
They can. The EPA notes that pyrethrins and permethrin are toxic to all insects and may harm honeybees, ladybugs and butterflies.¹ AgriLife adds that daytime use is likely to harm beneficial insects.³
What does a mosquito misting system cost?
Costs include the equipment, installation, concentrate refills and maintenance, so they continue every season. Sterile-male programs have no equipment to buy or maintain. Every SMF program is quoted for your property. Tell us about it and we'll reply within one business day. See the published results from public programs.
- U.S. EPA, "Mosquito misting systems": https://www.epa.gov/mosquitocontrol/mosquito-misting-systems
- American Mosquito Control Association, position statement on outdoor timed insecticide misting systems: https://www.mosquito.org/?p=56564
- Texas A&M AgriLife Extension Service, M. Merchant, S. Swiger and S. Presley, "Do-It-Yourself Backyard Mosquito Control," ENTO-054: https://livestockvetento.tamu.edu/files/2016/07/ENTO-054-DIY-Backyard-Mosquito-Control.pdf
- National Pesticide Information Center, Permethrin general fact sheet: https://npic.orst.edu/factsheets/PermGen.html
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Other comparisons: Barrier sprayingFoggingLarvicides and dunksCO2 mosquito trapsMosquito trapsBug zappersRepellents and devicesWolbachia malesGenetically modified mosquitoesBats, birds and mosquitofishNatural yard treatments Compare all options
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