Sterile mosquitoes vs mosquito traps
Some traps count mosquitoes, some catch them, some poison their nurseries. Here's how they compare.
Lure traps, lethal egg traps and larvicide bait stations can each lower Aedes mosquito numbers in field trials, but results depend on many units per home or block, steady upkeep, and the season. Sterile male mosquitoes work across a property by stopping wild females from producing offspring. In one California district, sterile males alone cut female mosquitoes 44%, and 65% combined with In2Care larvicide stations.¹
1. West Valley Mosquito and Vector Control District, California, April to November 2024, compared with the year before releases at the same sites. Stations were In2Care stations. Birhanie et al., Insects, January 2025. Details in our published results.
How mosquito traps work
Three designs share the yard aisle. They work in different ways.
Lure traps. A fan and a scent that mimics human skin (sometimes with CO2) pull host-seeking mosquitoes into a bag. In a randomized trial in Brazil with one trap per participating home, female Aedes aegypti fell significantly during the first 5 rainy months. The effect was not seen in the dry season that followed, and the next rainy period showed no significant difference.¹ The American Mosquito Control Association says such traps catch large numbers, but whether that reduces biting "is problematic."²
Lethal egg traps (ovitraps). A dark container of water attracts females ready to lay eggs and holds them on a sticky surface, with no insecticide. In a CDC field study in Puerto Rico, 3 to 4 traps per home in 81% of houses reduced female Aedes aegypti catches by 53% to 70%.³ That's a lot of buckets, kept up by a whole neighborhood.
Bait stations (autodissemination). Females visit a station, pick up a larvicide dust, and carry it to the water where they lay eggs, so their larvae fail to develop. In Trenton, New Jersey, 26 to 28 stations per city block of about 0.8 ha significantly reduced eggs and larvae.⁴ A later 3-year deployment by the same team found adult numbers stayed similar to untreated sites, and the authors pointed to the practical difficulty of covering many neighborhoods.⁵
1. Degener et al., Journal of Medical Entomology 51(2):408-420, 2014, cluster randomized trial, Manaus, Brazil, https://pubmed.ncbi.nlm.nih.gov/24724291/. 2. American Mosquito Control Association, "Traps," https://www.mosquito.org/traps/. 3. Barrera et al., Journal of Medical Entomology 51(1):145-154, 2014, CDC, Puerto Rico, https://doi.org/10.1603/ME13096. 4. Unlu et al., Parasites and Vectors 10:139, 2017, https://doi.org/10.1186/s13071-017-2034-7. 5. Unlu et al., Journal of Medical Entomology 57(4):1120-1130, 2020, https://pubmed.ncbi.nlm.nih.gov/32006427/.
How sterile males work
No traps to tend at every corner. The males go looking for the females.
We release male mosquitoes that don't bite and can't father offspring. A trap waits for mosquitoes to come to it; our males find wild females on their own, including where sprays and traps can't reach. Females that mate with them lay eggs that don't hatch. It's biological control that's precisely targeted: it affects only the two mosquito species we release.
Four steps to fewer mosquitoes
Side by side
The three trap types against a season of sterile males.
| Compared on | Sterile males (SMF) | Lure traps | Lethal egg traps | Bait stations |
|---|---|---|---|---|
| What it does | Stops wild females from producing offspring and collapses the population | Catches host-seeking mosquitoes | Catches egg-laying females | Females spread larvicide to their own breeding water |
| Coverage area | The property in your program | Close to the trap; trials used one per home¹ | Trials used 3 to 4 per home across most of a neighborhood² | Trials used 26 to 28 per city block³ |
| Reaches hidden breeding sites | Often. Males find wild females on their own, including in gutters, drains, dense plants and the yard next door | No | Only where a trap is placed | Partly: visiting females carry larvicide to their own breeding water |
| How long it lasts | Builds over the season while releases continue | While it runs; effect faded after the first rainy season in one trial¹ | While traps are kept up | While stations are stocked; adult effect not sustained at large scale⁴ |
| Effect on other insects | None. Only the two mosquito species we release. | Mostly mosquitoes | Targets egg-laying females; the CDC design uses no insecticide² | Uses a larvicide in breeding water |
| Pets and kids | Nothing applied; males don't bite | Powered unit, no insecticide | No insecticide; water container | Contains a larvicide; follow the label |
| Maintenance | A release plate twice a month (once a month in winter), about a minute; on commercial sites, our team or your staff release | Power, bag emptying, lure refills | Water, sticky surface and cleaning | Refills and placement checks |
| Cost model | Quoted for your property | Device purchase plus lures | Many low-cost units | Station purchase or service, plus refills |
| Best for | Season-long reduction across a property | Monitoring; a supporting tool | Community-wide programs | Combining with sterile males |
1. Degener et al., 2014, https://pubmed.ncbi.nlm.nih.gov/24724291/. 2. Barrera et al., 2014, https://doi.org/10.1603/ME13096. 3. Unlu et al., 2017, https://doi.org/10.1186/s13071-017-2034-7. 4. Unlu et al., 2020, https://pubmed.ncbi.nlm.nih.gov/32006427/.
Trapping to count vs trapping to control
Public programs use traps to measure. They rely on other tools to do the reducing.
A monitoring trap answers a question: how many mosquitoes, which species, and is it changing? That's why public mosquito control districts set them. With sterile males, you don't need a trap to tell: you should start to feel the difference within 7 to 14 days, and it keeps improving from there.
A control trap tries to catch enough mosquitoes to shrink the population. The trials above show that takes a lot of units, close to where mosquitoes breed, kept up through the season.
When traps are the right choice
Traps earn their place in some situations. Here's where they make sense.
- You want to know what's flying. A lure trap is a fine way to see species and numbers.
- A whole community commits. Egg-trap programs worked when most homes in an area took part.¹
- Bait stations alongside other tools. In the California district above, stations combined with sterile males gave the strongest result.²
1. Barrera et al., 2014, https://doi.org/10.1603/ME13096. 2. Birhanie et al., Insects, 2025.
Using them together
Tools that hit different life stages can stack.
Sterile males reduce the next generation. Bait stations target larvae in breeding water. That pairing is the one public data supports: 44% fewer females with sterile males alone and 65% with In2Care larvicide stations added, in a before and after comparison without an untreated control area.¹ Add free source reduction, tipping out water after rain, and you cover a lot of ground. We'll tell you whether stations are worth adding on your property.
1. West Valley MVCD, Birhanie et al., Insects, January 2025. See the published results.
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1. Barrera et al., 2014. 2. Degener et al., 2014. 3. American Mosquito Control Association, "Traps," https://www.mosquito.org/traps/.
Do mosquito traps work?
They catch mosquitoes. Whether they reduce bites depends on the type, how many you use and how well they're kept up. Egg traps worked in a field study at 3 to 4 per home across most of a neighborhood.¹ Lure traps showed a drop that didn't last beyond the first rainy season in one trial.²
What is the best mosquito trap for a yard?
It depends on your goal. For counting, a lure trap. For reducing Aedes across a property, trials point to many units plus breeding-site cleanup. Sterile males cover the property without placing a unit at every corner.
Do mosquito traps attract more mosquitoes?
Some can. The AMCA notes traps may draw in more mosquitoes than they catch, depending on placement and wind.³ Keep lure traps away from seating areas.
What are mosquito bait stations?
Devices that let egg-laying females pick up a larvicide and carry it to their breeding water. They're a tool used by public programs, often alongside others.
Can I use traps with sterile mosquitoes?
Yes. Lethal egg traps and bait stations can complement it, and a lure trap is a handy way to see what's flying. Tell us what you already use and we'll factor it into the plan.
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