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Mosquitoes

Summer is mosquito season!

MONITORING IN SEDGWICK COUNTY

Sedgwick County Health Department partners with the KDHE to monitor mosquitoes in Sedgwick County

  • KDHE tests mosquitoes in Kansas for West Nile virus.
  • Summer surveillance is done on a weekly basis from June through October. (See Weekly Mosquito Report.)
  • The Sedgwick County Health Department has 6 mosquito traps around the county. 

The Culex species mosquitoes are the primary vector (living organism that carry and transmit diseases to humans and animals through their bites), such as West Nile Virus (WNV). 

See the Culex Mosquito's Lifecycle: English | Spanish

Culex Mosquito image
Culex Mosquito (cdc.gov/mosquitoes)
Weekly Mosquito Report
  • Page Last Updated: July 02, 2026
  • Reporting Week Ending: June 29, 2026
Line chart titled "Mosquito Surveillance in Sedgwick County: Weekly Results from 5 Trap Locations." The chart compares the completed 2025 mosquito surveillance season (blue) with the current 2026 season (red), which is updated weekly as surveillance continues. The y-axis shows the total number of mosquitoes collected from five trap locations, ranging from 0 to 2,500. The x-axis shows calendar weeks from June through October. In 2025, total mosquito counts peaked at approximately 1,100 in mid-June, declined through July and August, then increased again to about 600 in mid-to-late September before decreasing into October. Culex mosquito counts followed a similar but lower pattern, peaking at approximately 340 in late June and about 220 in September. For the current 2026 surveillance season, data are shown through late June. Total mosquito counts increased from approximately 150 in early June to about 450 in mid-June, then declined briefly before rising sharply to more than 2,300 mosquitoes in late June. Most of the mosquitoes collected during this spike were Psorophora species, which are floodwater-dependent mosquitoes that commonly emerge in large numbers following heavy rainfall. These are the large black mosquitoes known for their particularly irritating bites. Culex mosquito counts remained relatively low throughout the period shown, generally below 50 mosquitoes. Overall, mosquito activity during the early weeks of the 2026 surveillance season was similar to or lower than 2025 until late June, when a substantial increase in total mosquito collections resulted in counts exceeding those observed during the same period in 2025.
Mosquito Monitoring Information Data
Traps Monitored 05
Mosquitoes Collected 2340
Number of Culex Mosquitoes 33
Percentage of Culex Mosquitos 1%
West Nile Virus (WNV) Pools Tested 0
Positive Pools 0
Human WNV Cases  0

PREVENTION IS KEY

Prevent mosquito bites by remembering the three D’s: DRAIN, DRESS, DEET.

OUTSIDE AREAS

DRAIN: Empty standing water around homes—mosquitoes lay eggs in stagnant water.

  • Use larvicides (like mosquito dunks) to treat standing water that:
    • Cannot be covered, dumped or removed
    • Will not be used for drinking
  • Refresh pet water bowls and kiddie pools every 3 days.
  • Check and repair window and door screens to keep mosquitoes out.

  • SCHD offers Mosquito Dunks®** at no cost. Call during normal business hours to arrange pick-up at 316-660-7300.
Bucket of stagnant water
YOU & YOUR FAMILY

DRESS: Wear long sleeves and pants when outdoors, especially during dawn and dusk when mosquitoes are most active.

DEET: Use EPA-approved insect repellents on skin as needed

  • Use repellent that contains 20 percent or more DEET, on exposed skin for protection that lasts several hours.
    • Parents should apply the product to their children, avoiding hands, eyes, and mouth.
    • Follow label directions. Do not over-apply.
YOUR PETS
  • Never use products containing DEET or citronella on pets as they can be toxic.
  • Always use products specifically designed for your kind of pet. For example, only use products made for dogs on your dog and products made for cats on your cat.
  • Talk to your veterinarian about the best options for protecting your pet from mosquitoes that carry disease (such as heartworm). 
YOUR CLOTHING & GEAR

Use products that contain permethrin on clothing. Treat clothing and gear, such as boots, pants, socks and tents.

MOSQUITO-BORNE DISEASES 
Chikungunya* (CDC)
Dengue Fever
Heartworms in Animals* (CDC)
Malaria* (CDC)
Yellow Fever* (CDC)
West Nile Virus (WNV)
Zika Virus

*External Links

TOOLS

Click on the image below to use the Environmental Protection Agency's (EPA) Insect Repellent Search Tool* to find the repellent that is right for you. 

Insect Repellent
EPA Insect Repellent Search Tool

FAST FACTS

  • In Kansas, the main mosquito species that carry West Nile virus are the Culex species mosquitoes. Read more about the Culex species here: Culex Species 
  • West Nile virus (WNV) is the most common mosquito-borne disease in Kansas and the United States.
  • Female mosquitoes bite people and animals to get a blood meal. Most female mosquitoes cannot produce eggs without a blood meal.
  • Male mosquitoes do not bite people and animals.
  • Mosquitoes need water to breed. They don’t lay their eggs in the air or on the ground.
  • Larvicides are chemicals used to kill young mosquitoes before they grow into adults. They are put directly into water where mosquitoes lay eggs or where the baby mosquitoes (called larvae) live. When used properly, larvicides can help lower the number of mosquitoes by stopping new ones from being born.
  • Adulticides are products that kill adult mosquitoes. These can be sprayed by hand, from trucks, or even from airplanes. When used the right way, adulticides can quickly reduce the number of adult mosquitoes in an area. This helps protect people from mosquito bites and diseases like West Nile Virus. 

NOTE: While the county does not use adulticides or conduct mosquito spraying, individual cities within the county may choose to implement their own mosquito control measures

FUN FACT

Dragon Fly and Mosquito

* External Link

** The Sedgwick County Health Department provides no-cost Mosquito Dunks® to residents as part of our mosquito prevention program. These contain a naturally occurring bacteria (Bti) that targets mosquito larvae. For more information about how they work, visit the manufacturer's website here.*

NOTE: The county does not endorse any specific brand.