January 2020 District Newsletter

New from the District in January: New Year, New Mosquito Worries

Click here to read the January 2020 District Newsletter.

Blog post Casey Stevenson

Seasonal Sites of Mosquito Development

The District staff has been hard at work inspecting and treating their seasonal rainwater impounds for mosquitoes such as Aedes squamiger, the winter salt marsh mosquito. This mosquito can fly up to 20 miles. It is an aggressive, day-biting mosquito, and can be a major pest to humans. Throughout San Mateo County, there are 245 sites that are inspected weekly by our staff starting now and continuing into May, depending on how much rainfall we get during this time period.

Blog post Casey Stevenson

Aedes aegypti Site Reduction Program

In December, we started working on reducing the number of site visits in the neighborhood where Aedes aegypti was discovered in 2013. We are taking a cautious approach to this reduction by reclassifying the sites that have not had any mosquito detections in the last 2 years. This change will allow us to continue to view the sites in our database, but they will not fall under our current inspection protocol of 4 visits a year. Currently we have 888 Ae. aegypti sites in this zone.

Blog post Tara Roth, Ph.D.

The Real Wet Bandits

Living in California, we often welcome the rainy season as a sign that we won’t have to turn the water off while we soap up in the shower, but did you know that there are many insects that welcome the rain as well? Outside, the influx of water may trigger some insects to hatch from eggs, others to begin searching for food, and still others to spread out and seek new places to live.

Blog post Brian Weber

Joint Bed Bug Training with City of San Mateo Code Enforcement

On November 15th, our district hosted a Bed Bug Training with the City of San Mateo’s Code Enforcement Division. The training was provided by Nader Shatara who is a Senior Environmental Health Inspector for the San Francisco Department of Public Health. The City of San Mateo Code Enforcement recently took over responding to bed bug complaints for properties that are 4 units or more. The biggest concern with Bed Bugs is they feed on humans while they sleep and can cause allergic reactions because of the saliva injected during feedings.

Blog post Brian Weber

Technicians Attend West Coast Rodent Academy

In November, Field Supervisor Casey Stevenson and Vector control Technician Walter Bruj attended The West Coast Rodent Academy in Irvine, CA at the University of California’s South Coast Research and Extension Center. The workshop included lectures, hand-on activities and break-out sessions with industry professionals that helped us gain a better understanding of rodent ecology and integrated pest management (IPM).

Blog post

Holiday Visitors from the Great Outdoors

Everyone likes to be cozy in the winter, and neighborhood wildlife is no exception. Animals like raccoons, opossums, and skunks can find it hard to resist the tempting warmth of your attic or crawl space. Now is a great time to check your vents and other openings to make sure they’re tightly sealed against animal intruders. Don’t forget areas under decks and porches and on top of roofs – skunks are great at digging and raccoons love to climb. Even your pet door can provide access to an inquisitive animal if left unsecured at night.


December 2019 District Newsletter

New from the District in December: Happy Holidays!

Click here to read the December 2019 District Newsletter.

Blog post

Ready for Rain? Mosquitoes Are!

As fall turns to winter and the weather gets wetter, you may be spending less time in your garden, but mosquitoes will be making themselves right at home. In San Mateo County, our weather never gets cold enough to completely stop mosquitoes from reproducing, even on our chilliest days. Items that can hold rainwater for more than a few days – everything from wheelbarrows and wagons to plant saucers and kids’ toys – can quickly become habitat for thousands of mosquito larvae.

Blog post

Time for Ticks

In some parts of the country, the weather is getting cooler and tick season is winding down. Here in San Mateo County, however, tick season is just beginning. Ticks become abundant shortly after the first rain of the season, and continue questing through the winter and spring. Adult western blacklegged ticks, our local Lyme disease vector, are most abundant December through May, while adult Pacific coast ticks and American dog ticks are most abundant in the spring and early summer.


November 2019 District Newsletter

New from the District in November: Time for Ticks!

Click here to read the November 2019 District Newsletter.

Blog post Tara Roth, Ph.D.

Fall Back, Spring(tails) Forward

When the temperatures start to change and the nights become colder, you may begin to notice six-legged visitors coming inside your home. As we shutter our doors and windows to keep out the cold, the humidity rises indoors.  This elevated humidity can attract insects and arthropods, including tiny insects called Collembola, or springtails.


Ready, Set, TICKS!

We’ve heard concerns from some parents lately about ticks on athletic fields, and we want to make sure everyone has the information they need to keep their family safe.


October 2019 District Newsletter

New from the District in October: Spooky Spiders on the Move

Click here to read the October 2019 District Newsletter.

Blog post

Eastern Equine Encephalitis Virus (EEEV) making you EEEk this Halloween?

Eastern equine encephalitis virus, often termed EEEV or Triple-E, has been making headlines lately in the United States. This mosquito-borne virus can cause a sometimes-fatal brain infection. With 31 cases and 9 deaths this year to date, this is the worst outbreak of EEEV disease since the US began monitoring the disease 15 years ago. While those numbers sound scary, EEEV disease is relatively rare.  An average of 7 human cases of EEEV disease are diagnosed in the United States annually.

Press release

San Mateo County Mosquito & Vector Control District Honored for Financial Transparency

Burlingame, CA

Oct. 3rd, 2019

Earlier this month, San Mateo County Mosquito and Vector Control District was awarded the Certificate of Achievement for Excellence in Financial Reporting by the Government Finance Officers Association after submitting its Fiscal Year 2017/2018 Comprehensive Annual Financial Report (available at for review. The Comprehensive Annual Financial Report was judged by an impartial panel to meet the high standards of the program.


SMCMVCD Awarded the GFOA Certificate of Achievement in Financial Reporting

San Mateo County Mosquito and Vector Control District’s 2018 comprehensive annual financial report (CAFR) has been awarded the Government Finance Officers Association’s Certificate of Achievement for Excellence in Financial Reporting. The Certificate of Achievement is the highest form of recognition in governmental accounting and financial  reporting, and its attainment represents a significant accomplishment.


September 2019 District Newsletter

New from the District in September: Aedes aegypti Moves Closer to the Bay Area

Click here to read the September 2019 District Newsletter.


August 2019 District Newsletter

New from the District in August: Oh, Rats!

Click here to read the August 2019 District Newsletter.

Blog post

Rats Can Ruin Your Vacation, Too

Traveling to Hawaii this summer for a much needed vacation? Be aware of rat lungworm! This brain parasite is on the rise with six official cases confirmed so far this year.