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Solano County mosquito district briefs Rio Vista commission on West Nile surveillance and Aedes risk
Summary
Miguel, district manager for the Solano County Mosquito Abatement District, told the Rio Vista commission the district monitors larvae, uses traps and dead‑bird sampling for West Nile surveillance, and is tracking the invasive Aedes aegypti (detected in Dixon); large adulticide operations are publicized in advance.
Miguel, district manager for the Solano County Mosquito Abatement District, told the Rio Vista Parks & Recreation Commission that his agency runs regular larval and adult surveillance and uses a mix of biological, physical and chemical controls to limit mosquito populations. "We check these traps weekly for abundance," he said, describing New Jersey light traps and CO2 traps the district deploys around the county.
Why it matters: Mosquito surveillance helps detect West Nile virus and invasive species early. Miguel said 12 of the 24 species in the district are important disease vectors and identified Culex pipiens and Culex tarsalis as common West Nile vectors. He warned that some Aedes species are aggressive, can fly long distances, and that Aedes aegypti — an invasive species — has been found in Dixon.
What the district does: Miguel explained field methods and response thresholds. Technicians perform larval surveillance, collect and count adults, submit dead‑bird samples to the state lab in Davis for testing and maintain sentinel chicken flocks for early detection. "We also set New Jersey light traps. We have 23 locations within the county," he said. Larvicide treatments are applied to water sources; adulticide treatments are used when surveillance shows elevated adult abundance or detections of West Nile or invasive Aedes.
Notifications and public help: The district distinguishes routine larvicide work from large adulticide operations. Miguel said the district does not notify the public for routine larvicide treatments but now posts notifications on its website and sends alerts and city public‑information lists for large adulticide events: "We've actually started implementing that. We put it on our website, and we usually send the information to the city's PIO."
Public guidance: The presenter urged residents to remove standing water (tires, containers, gutters), report dead birds via the state hotline or website, and sign up for district email notifications for localized alerts. Miguel offered to send the commission his PowerPoint and field materials for review.
Next steps: The commission accepted the presentation and asked staff to post the district's materials and share the PowerPoint with commissioners so they can better track neighborhood surveillance and coordinate notifications.
