In response to significant rainfall and reestablishment of mosquito breeding sites in the urban wetlands, the Orange County Mosquito and Vector Control District (OCMVCD) will apply a mosquito larvicide by helicopter to marsh and other natural waterway areas of Orange County on Wednesday, April 12, 2017 between the hours of 10 a.m. – 1 p.m., weather permitting. The type of product used by the District is a granular larvicide (VectorBac G®) that acts in water specifically on mosquito larvae and will not harm people, pets, plants, or wildlife. The larvicide contains Bacillus thuringiensis israelensis (Bti), a naturally-occurring bacteria that targets mosquito larvae and prevents them from developing into biting adults.
The sites to be treated are as follows: Peters Canyon Reservoir, Villa Park Dam, Santiago Pit North, Santiago Pit South, and the Loma Pond. These are marshy, natural areas, which are common breeding grounds for mosquitoes. Mosquitoes collected from these areas in March 2017 averaged 52 mosquitoes per trap-night, as compared to the 5-year average of 21 per trap-night, indicating a 140% increase in mosquito abundance from wetlands in 2017. Mosquitoes from these locations and others in the County are monitored and tested for the presence of West Nile virus (WNV) and other mosquito-borne diseases.
For more information, call the OCMVCD at (714) 971-2421.