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Mosquito district warns of early West Nile activity, outlines control options
Summary
At the May 20 council meeting Sacramento–Yolo Mosquito and Vector Control District staff reported early West Nile detection in Sacramento, growing invasive mosquito populations in West Sacramento, and described surveillance, sterile-insect pilot results (40% reduction in one area), and free services including inspections and mosquito fish.
A representative of the Sacramento–Yolo Mosquito and Vector Control District briefed the West Sacramento City Council on May 20 about preparations for mosquito season and recent detections of arbovirus activity.
The presenter said the district found its first mosquito samples positive for West Nile virus this season in Tahoe Park, Sacramento and noted that a growing population of invasive, day-biting mosquitoes capable of transmitting dengue is present in parts of West Sacramento. “We actually got our first mosquito samples that tested positive for the virus in Tahoe Park in Sacramento,” the presenter said, describing the earlier-than-usual timing and the potential for a busy season.
The district described an integrated mosquito-management approach that includes public education, lab surveillance, biological controls (mosquito-eating fish for ponds and fountains), and targeted control operations. The presenter summarized a recent sterile insect technique (SIT) pilot in South Natomas that released sterile male mosquitoes and reported a roughly 40% reduction in mosquito populations in that area.
District staff encouraged residents and event organizers to reduce backyard breeding sources (emptying dog dishes, fountains, kiddie pools) and offered free home inspections, free mosquito fish for ponds, and repellent wipes for city events and organizations working with people experiencing homelessness. The district also said it will continue surveillance and consider expanding SIT to other areas based on outcomes.
Council members and staff expressed interest in coordinating distribution of mosquito fish for waterways and connecting the district with reclamation-district leadership to identify sites for biological control.
