Lifetime Citizen Portal Access — AI Briefings, Alerts & Unlimited Follows
Madera County mosquito control details faster testing, sterile-mosquito release and area-wide larvicide plans
Loading...
Summary
The Madera County Mosquito Vector Control District told supervisors it has increased surveillance, added in-house viral testing to cut lab turnaround, and plans to deploy area-wide "walls" larvicide spraying and sterile-mosquito release (Wolbachia/IIT) to reduce Aedes aegypti and other nuisance species.
Abraham Velasquez, biologist for the Madera County Mosquito Vector Control District, told the board the district has expanded trap coverage across the county and will begin in-house testing for mosquito-borne viruses to shorten the weeklong turnaround previously required when samples went to outside labs.
"When we send our samples out, it would take around 7 days to get a response back from CDPH...that 7 day or 1 week time frame lags our response time," Velasquez said, and added the district now plans to perform PCR testing in-house for West Nile virus and other arboviruses to speed responses.
Velasquez also described operational tactics planned for 2026: area-wide applications the district called "walls," using a truck-mounted blower to spray larvicides into containers across neighborhoods; and a sterile-insect approach (IIT/Wolbachia) in which male mosquitoes carrying Wolbachia are released to produce unviable eggs when they mate with wild females.
"So this upcoming year we're gonna implement new techniques to again better serve and protect our public from not only disease transmission, also nuisance mosquito bites," Velasquez said.
He noted that the district's surveillance increase was not only for West Nile virus but also to track Aedes aegypti, the species that prefers humans and is associated with dengue and other viruses. Velasquez said Aedes aegypti was first detected in California in 2013 and is difficult to control because its eggs can be desiccation-resistant and hatch when later exposed to water.
Board members asked operational and public-notice questions. Velasquez recommended checking insect repellent labels for active ingredients (higher concentration of DEET can be more effective) and suggested BG Sentinel traps for specific monitoring. He said the district will notify the public prior to area-wide spraying and that the products planned are safe for people and the environment, while acknowledging outreach will be needed to explain the program.
The presentation also covered service-area limits (the district serves subdivisions inside its jurisdiction) and seasonal staffing: about 25 to 30 seasonal technicians will continue door-to-door inspections and treatments aimed at eliminating standing water.
The board thanked the presenters and had no objections to the proposed tactics; officials emphasized the need for outreach before any broad applications.
