July 2017 District Report

This month at the District:  yellowjackets, biting mites, and more.

Click here to read the July 2017 District Report.

Blog post

The Bite of the Mite

Mites are probably one of the most common insects on the earth and the vast majority of them have not been described yet. While the majority of them are harmless to humans and even helpful to us, there are several that are found in San Mateo County that can be a right nuisance. Most of these species are unable to invade your home without their host (usually rats or wild birds) but once there, they may bite humans if they reach a large population size or their host dies. Below are some of the most common biting mites in San Mateo County.

General information

Job Opening: Finance Director

Reporting directly to the District Manager, the Finance Director oversees all administrative and accounting procedures and performs necessary tasks to ensure timely completion of assignments and requirements. The incumbent performs a wide variety of financial and administrative work requiring research, analysis, independent judgment and collaborative skills.


CO2 Traps
June 2017 and Year to Date

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.


June 2017

5-year June average


Rodent-Borne Disease Updates

Laboratory staff conducted two surveys of wild rodents in the month of June. The surveys took place in Water Dog Lake park in Belmont on June 14th and 15th and Eaton and Big Canyon parks in San Carlos on June 20th and 21st.  Blood samples were taken from captured rodents by a subocular bleed with a microcapillary tube and ear punches were also taken from the rodents. The blood and ear tissue will be tested in our District laboratory for Borrelia bacteria that cause Lyme disease and other infection.


West Nile Virus Surveillance
July 7, 2017

San Mateo County

As of June 630, 2017, there have been 215 dead birds reported in San Mateo County. Of those, 45 have been suitable for testing and 1 has tested positive (2%) for West Nile Virus (WNV). No dead squirrels or mosquito pools have been tested for West Nile Virus in San Mateo County thus far this year.


Putting the Sting on Wasps, Bees, and Their Wanna-Bees

Did you know that there are more stinging insects than just wasps and honey bees? Stinging insects are grouped into the family Hymenoptera and are distinguished by having 2 sets of wings, a cinched “wasp waist,” and an ovipositor that has been modified into a stinger. That is about where the comparisons end however. The following article covers the incredible diversity of stinging insects and even points out a couple of the “wanna-bees” that have evolved to mimic their much more aggressive cousins.


Invasive Aedes Mosquitoes


Request Service


Report a Dead Bird


Board Meeting Agendas