Mosquito Control & Prevention
Missouri mosquito season runs March through October. Learn about the species that carry disease, what attracts them to your yard, and how professional treatment dramatically reduces populations.
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Mosquito Species in St. Louis
Missouri mosquito season runs from March through October — eight months of biting, buzzing, and disease risk. The St. Louis metro area’s hot, humid summers and abundant water sources make it one of the worst mosquito regions in the Midwest. Mosquitoes are not just a nuisance; they are vectors for West Nile virus, Zika, Eastern equine encephalitis, and other diseases reported in Missouri.
Culex Mosquitoes
The primary vector of West Nile virus in the St. Louis area. They breed in stagnant water (storm drains, birdbaths, clogged gutters) and are most active at dusk and dawn.
Aedes Mosquitoes (Asian Tiger Mosquito)
Aggressive daytime biters that breed in small containers of standing water — flower pots, tires, bottle caps. The Asian tiger mosquito (Aedes albopictus) is well-established in Missouri and is a known vector of Zika and dengue.
Anopheles Mosquitoes
Found near permanent water bodies. While historically the malaria vector, they are primarily a nuisance biter in Missouri today.
What Attracts Mosquitoes to Your Yard
- Standing water — Even small amounts in flower pot saucers, bird baths, gutter debris, tarps, or toys. Mosquitoes need as little as a bottle cap of water to breed.
- Dense vegetation — Mosquitoes rest in shaded foliage during the day. Overgrown shrubs, tall grass, and ground cover provide ideal harborage.
- CO2 and body heat — Mosquitoes locate hosts by detecting carbon dioxide exhalation and body heat from up to 150 feet away.
- Moisture and shade — Damp, shaded areas of your yard harbor more mosquitoes than sunny, dry areas.
- Outdoor lighting — Lights attract the insects mosquitoes feed on, indirectly increasing mosquito activity near lit areas.
How Roberts Controls Mosquitoes
Roberts uses a two-pronged mosquito control program that attacks mosquitoes at both stages of their life cycle — most companies only address one.
In2Care Larvicide Stations
Installed in March before mosquito populations emerge. These barcoded stations kill larvae directly and use an autodissemination effect — adult mosquitoes that visit the station carry bioactive ingredients to other breeding sites on your property, extending control far beyond the station itself. Stations are maintained monthly throughout the season.
Barrier Mist Application
Applied monthly from April through October to perimeter vegetation where adult mosquitoes rest during the day. The microencapsulated formulation bonds to leaf surfaces and releases active ingredient over time for extended residual control.
Event Sprays
Planning an outdoor party, wedding, or special event? We offer one-time barrier treatments that dramatically reduce mosquito populations for your event. Call to schedule at least 48 hours in advance.
DIY Prevention Tips
- Eliminate standing water — Dump flower pot saucers, clean clogged gutters, empty bird baths weekly, check tarps for pooling water.
- Trim vegetation — Keep grass mowed short and trim shrubs where mosquitoes rest during the day.
- Use fans — Mosquitoes are weak fliers. A fan on your patio or deck makes it much harder for them to land.
- Fix screens — Ensure window and door screens are intact and free of holes.
- Treat permanent water — Use larvicide dunks in ponds, rain barrels, and water features that can’t be emptied.
- Start early — Prevention is most effective when started in March before populations build.
Dual Attack
Larvicide stations kill larvae + barrier mist kills adults
In2Care Technology
Autodissemination carries control to breeding sites we can't reach
Monthly Service
Barcoded stations maintained monthly from March through October
Event Sprays
One-time treatment for outdoor parties and special events
Don’t wait until June. The earlier you start mosquito control, the better your season-long results. March is the time to begin.
Call (314) 967-2847 (BUGS)Why Choose Roberts?
- Dual Approach — Larvicide + barrier mist targets both life stages for maximum population reduction
- In2Care Autodissemination — Extends control to hidden breeding sites we can't physically reach
- Season-Long Program — March through October coverage with monthly maintenance visits
- Event Spray Option — One-time treatments available for outdoor parties and special occasions
What to Expect
- Free Inspection — We assess your yard for breeding sites, vegetation harborage, and overall mosquito pressure.
- Larvicide Station Install — In2Care stations placed in March before mosquito populations emerge.
- Monthly Barrier Mist — Perimeter vegetation treated monthly April through October.
- Season-Long Monitoring — Stations serviced monthly. We adjust the approach based on conditions.
Service Area
- Jefferson County (Festus, Crystal City, Arnold, Imperial, Barnhart, High Ridge, Hillsboro, De Soto, Herculaneum)
- St. Louis County (South County, Mehlville, Oakville, Affton, Kirkwood, Webster Groves, Crestwood)
- St. Charles County (St. Charles, O'Fallon, St. Peters, Wentzville, Lake St. Louis)
- St. Francois County (Farmington, Park Hills, Bonne Terre, Desloge)
- Ste. Genevieve County
- Washington County (Potosi, Mineral Point)
- City of St. Louis and surrounding municipalities
- Franklin County (Union, Washington, Pacific, Sullivan)
Schedule Your Free Estimate
Fill out the form below and we’ll get back to you fast — usually same day.
Frequently Asked Questions
When should I start mosquito treatment?
March. Our larvicide stations go in before mosquitoes start emerging. Waiting until June when mosquitoes are already thick means you’re playing catch-up all summer. The earlier you start, the better the season-long results.
Is mosquito treatment safe for my pets and kids?
Yes. The barrier mist is applied to perimeter vegetation, not to lawn areas where people and pets spend time. Once dry, the treated vegetation poses no meaningful risk. The In2Care larvicide stations target mosquito larvae specifically and are safe around pets and children.
Will your treatment eliminate every mosquito?
No treatment eliminates 100% of mosquitoes — anyone who promises that is not being honest. Our program dramatically reduces the mosquito population on your property to the point where you can enjoy your yard. Mosquito control is about significant population reduction, not total elimination.
What about standing water I can't eliminate?
That’s exactly what In2Care is designed for. The autodissemination effect means mosquitoes that visit our stations carry bioactive ingredients to other water sources on your property — including ones we can’t physically access or treat directly. For permanent water features, we can also recommend larvicide dunks.
Do you offer one-time event sprays?
Yes. If you’re hosting an outdoor party, wedding, graduation, or other event, we offer one-time barrier treatments that dramatically reduce mosquito activity for your gathering. Call at least 48 hours in advance to schedule. Event sprays are available even if you’re not on our regular program.