Placer Mosquito is implementing its invasive mosquito response plan

Roseville, Calif. – The Placer Mosquito and Vector Control District have detected invasive Aedes aegypti mosquitoes in the Foothills/Junction neighborhood of Roseville. Aedes aegypti mosquitoes, commonly known as yellow fever mosquitoes, were found Friday, May 31, in the Roseville neighborhood. This detection marks the first location where invasive Aedes have been found in Roseville for 2024.

Aedes aegypti mosquitoes have been spreading throughout California since 2013 and in Placer County since 2019. This mosquito is small with black and white striped legs. Aedes aegypti mosquitoes can transmit several viruses, including Zika, dengue, chikungunya and yellow fever although these diseases are not circulating in Placer County. Last year, two cases of locally transmitted dengue were reported in Long Beach and Pasadena.

⤹ Roseville: June 20- 23! ⤸

⤹ Roseville: June 20- 23! ⤸

⤹ Roseville: June 20- 23! ⤸

⤹Roseville: June 20- 23! ⤸


Placer Mosquito will follow its invasive mosquito response plan to determine the extent of the infestation. The District needs residents to help by allowing our technicians to access and inspect front and back yards of properties in the Foothills/Junction neighborhood. Appropriate treatments will be made to help limit the spread of these mosquitoes. Residents can help limit mosquito development by removing all standing water from their yards.

For the most up to date information about invasive Aedes in Placer County, visit

History of Invasive Aedes Mosquitoes in Placer County

  • August 29, 2019 – First invasive Aedes aegypti mosquito detected in south Placer County
  • Summer 2020 and 2021 – No invasive mosquito detections
  • July 14, 2022 – Aedes aegypti mosquito found in Granite Bay
  • August 3, 2022- More Aedes aegypti mosquitoes and larvae detected in Cresthaven, Theiles Manor, Cherry Glen and Hillcrest neighborhoods of Roseville
  • June 13, 2023 – Aedes aegypti mosquito found in Cherry Glen neighborhood of Roseville
  • Summer 2023 – Aedes aegypti mosquitoes endemic in Cherry Glen, Hillcrest, Cresthaven and Theiles Manor neighborhoods of Roseville
  • October 13, 2023 – Aedes aegypti mosquitoes found in Stanford neighborhood of Roseville
  • May 31, 2024 – Aedes aegypti mosquitoes found in Foothills/Junction neighborhood of Roseville

How to Protect Yourself from Invasive Aedes

  • Report unusual, daytime mosquito biting to the District
  • Eliminate standing water, runoff or pooling from irrigation systems
  • Use EPA-registered repellents to prevent mosquito bites

For more information, contact the Placer Mosquito and Vector Control District at (916) 380-5444 or

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