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Vector-control official warns Winters to ready for active mosquito season after late rains
Summary
A Sacramento–Yolo vector-control representative told Winters council that late spring rains have created ideal breeding conditions and described a pilot sterile-male release program; the district urged residents to remove standing water and use free inspection services.
A representative of the Sacramento Yolo Mosquito and Vector Control District told the Winters City Council on April 21 that late spring rains followed by warming temperatures have created ideal conditions for mosquitoes and could make 2026 a busier season.
The presenter, identified at the meeting as a district official, said the city itself had no detected West Nile virus activity but that county surveillance found positive samples nearby. "So far, there is no West Nile virus activity in the city of Winters," the official told the council, adding that 77 mosquito samples in the county tested positive and five positive birds were recorded. The presenter cautioned the council that statewide human cases numbered 113 and that Centers for Disease Control estimates suggest many infections go unreported.
The official described invasive, day‑biting mosquitoes first found in Winters in 2020 and stressed they are harder to control because they breed in very small containers. "They lay eggs singly along the edges of the container, and once eggs are laid, they can actually be viable for up to six months," the presenter said, urging residents to empty plant saucers, buckets and pet dishes.
Council members and the public were briefed on a pilot control technique the district tested in Sacramento. "We actually released about 500,000 sterile male mosquitoes that contain the bacteria called Wolbachia," the presenter said. According to the speaker, treated pilot areas saw population declines of roughly 25 to 40 percent when sterile‑male releases were combined with targeted adult spraying.
The district representative encouraged homeowners to request free inspections and treatments and noted the agency can supply mosquito fish for ponds and one‑time repellent wipes for outdoor events. Residents who spoke during public comment thanked the district for quick responses to downtown breeding sites and asked about decorative barrels and pergolas that collect water. The presenter said staff had placed larvicide pellets and would continue outreach.
Council members did not take formal action at the briefing but heard the district recommend continued surveillance, resident cooperation in removing standing water and consideration of expanded pilot tools if invasive mosquito activity increases.
The council moved on to other business after public comment; the district confirmed it will have a presence at an upcoming youth day event to distribute outreach materials.
