Mosquito surveillance data reports the abundance of various species of mosquitoes in San Mateo County.
Different mosquito species have different seasonal life cycles, bite different hosts at different times of day, and transmit different diseases. It’s important for District staff to know what mosquito species are present in order to minimize annoyance and, more importantly, disease risk to humans and domestic animals.
These graphs track the number of mosquitoes of each species (vertical axis) by month (horizontal axis). These are frequently compared to a five-year average of each mosquito species by month, allowing staff to determine whether we have more, less, or about the same mosquito populations as most years.
For more information about how the District traps mosquitoes for disease and population surveillance, see Mosquito Trapping and Pools.
The table shows the proportions of common mosquitoes in San Mateo County that were collected in carbon dioxide baited traps in June 2017 compared with the five-year average during June.
The table shows the proportions of common mosquitoes in San Mateo County that were collected in carbon dioxide baited traps in May 2017 compared with the five-year average during May.
The table shows the proportions of common mosquitoes in San Mateo County that were collected in carbon dioxide baited traps in April 2017 compared with the five-year average during April.
The table shows the proportions of common mosquitoes in San Mateo County that were collected in carbon dioxide baited traps in March 2017 compared with the five-year average during March.
The graphic below shows the average number of mosquitoes per trap collected each night in CO2 traps. It includes common species found in San Mateo County.
This graph shows the monthly numbers of Culiseta and Culex mosquitoes collected by New Jersey light traps in San Mateo County for the entire year of 2016.
Monthly abundances of five common mosquito species in San Mateo County, Aedes dorsalis, the summer salt marsh mosquito, Culex erythrothorax, the tule mosquito, Culex pipiens, the northern house mosquito, Culex tarsalis, the western encephalitis mosquito, and Culiseta incidens, the cool weather mosquito.
Click on the graphic below to see the population fluctuation this spring and summer.
Mosquito surveillance data from August 2016 is in. You can see how this year’s mosquito populations stack up against the 5-year average by clicking the graphic below.
Mosquito larval surveillance data from April 2016 is in. You can see the average number of mosquito larvae per sample (“dip”) for the various areas of the county on the graph below.
Mosquito surveillance data from February 2016 is in. You can see how this year’s mosquito populations stack up against the 5-year average by clicking the graphic to the left.
