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Mosquito Control Treatments

To help prevent the spread of mosquito-borne viruses, the District will carry out weekly mosquito control treatments using truck-mounted equipment.

When: Saturdays from 1am to 7am. July 19th through September 13th, 2025

Application Method: Wide Area Larvicide Spraying (WALS)

  •  The District's WALS method uses a powerful truck-mounted sprayer that combines high volumes of air and low volumes of liquid larvicide mixed with water to efficiently treat a wide variety of mosquito breeding sites. 
  • WALS effectively reaches small and hard to find mosquito habitats that can potentially collect water and are ideal for mosquito breeding. 

Application Product: VectoBac WDG

  • The product used for this type of application is an organic OMRI rated product. This product uses a type of naturally occuring bacteria.
  • When applied as directed, the product will not harm people, pets, nor wildlife including aquatic life, other insects, and honeybees. 

Vectobac WDG

How does the District determine where to conduct mosquito control applications?

When determining an area for area-wide applications for the coming season, the District’s Integrated Vector Management team analyzes monthly historical Aedes aegypti population data by city or unincorporated county area to forecast peak mosquito activity for the coming season. Then using GIS software, District staff define areas within cities or unincorporated areas with the highest Aedes aegypti activity by examining and visualizing service requests, larval samples, and invasive Aedes trap count data. Based on this data analysis, specific sites within the District are prioritized and targeted for area-wide application to drive down the forecasted peak in the coming season. Once sites are determined and the budget for the coming fiscal year is approved by the Board of Trustees, the IVM team begins planning for the area-wide application to determine the most appropriate means of public outreach to the affected local government entities and residents of the area-wide application area as well as to finalize the means of application and method of efficacy assessment.

2025 Neighborhoods:

A detailed street map with highlighted roads, including names like Santa Rosa Way, San Gorgonio Ave, and San Nicholas Ave.
Palm Desert
A map showing streets and avenues with some highlighted routes, including Camino Arroyo, Sierra Madre, and more.
Palm Desert
A street map showing an area with labeled roads including Ramon Rd, El Cielo Rd, Mesquite Ave, and others in a grid-like layout.
Palm Springs
A street map with labeled roads, including Avenida Juarez, Via Altamira, and Desert Vista Road.
Cathedral City
A detailed street map with highlighted roads, including names like Santa Rosa Way, San Gorgonio Ave, and San Nicholas Ave.
A map showing streets and avenues with some highlighted routes, including Camino Arroyo, Sierra Madre, and more.
A street map showing an area with labeled roads including Ramon Rd, El Cielo Rd, Mesquite Ave, and others in a grid-like layout.
A street map with labeled roads, including Avenida Juarez, Via Altamira, and Desert Vista Road.

 

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