September 25, 2025.

HAYWARD, Calif.- This week, Alameda County Mosquito Abatement District staff discovered multiple Aedes aegypti mosquitoes in the Jensen and Windmill Springs neighborhoods of Livermore. After inspecting several properties in the area, District staff determined that using a truck-mounted mist sprayer would be the most effective method to eliminate emerging mosquitoes. Weather permitting, residents in these neighborhoods can expect to see District vehicles on the roads on September 26 between 3:00 a.m. and 5:00 a.m.

Application details: 

• Insecticide: VectoBac WDG 
• Active ingredient: Bti (Bacillus thuringiensis sub-species israelensis) 
• Bti is a naturally occurring bacteria found in soil, and it produces crystal shaped proteins which kills only the larval stage of mosquitoes, black flies and midges. It is non-toxic and non-pathogenic to humans, birds, fish, mammals and beneficial insects (e.g., pollinators). 

• Method: Truck-mounted mist sprayer 
• Date & Time: September 26th (weather permitting), 3:00–5:00 a.m. 
• Residents are encouraged to stay indoors during these hours. 
• Location: Between N Mines Rd and Hillcrest Ave, south of the railroad tracks to East Ave. Picture is below. 
• Additional details: The treatment may leave a light residue, but it will wash away with water, and it is safe to drain into the sewer. 

Aedes aegypti is an invasive and dangerous mosquito that lays eggs in containers, with larvae hatching in standing water. Mosquitoes cannot complete their life cycle without standing water, therefore treating the water is the best and most convenient way to prevent future mosquitoes. By treating water sources—especially hidden ones, also known as “cryptic” sources, like garden tools, toys, tarps, and pots—the District can make water inhospitable to mosquitoes while keeping it safe for people, pets, and wildlife.District staff recently conducted a similar treatment in the Altamont Creek neighborhood on September 5th with great success. 

Field Operations Supervisor Joseph Huston stated, “With the recent shifts in weather, from rain to sunshine, we anticipated an increase in standing water, which provides mosquitoes with opportunities to emerge. We greatly appreciate that most residents have allowed us to inspect their yards for potential sources. However, when we are unable to access every yard, it becomes more difficult to identify the sources of these aggressive mosquitoes. In response to these detections, we will conduct a wide-area larval control operation to ensure that mosquito larvae hidden in small, hard-to-find sources around yards are effectively treated.”

Community cooperation is essential for effective mosquito control. 

• Report mosquito activity in your neighborhood to the District. 
• Eliminate standing water where mosquitoes breed, including outdoor containers, plants, unmaintained swimming pools, and other hidden sources. 
• Protect yourself by wearing long, loose clothing, using insect repellent in mosquito-prone areas, and maintaining window screens. 

The District is committed to its mission and continues to conduct adult mosquito surveillance and larval control efforts throughout Alameda County.

The treatment area is between N Mines Rd and Hillcrest Ave. District trucks will be south of the railroad tracks all the way to East Ave.