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September 2023 Newsletter

A computer-generated image of the side, underground view of a yellowjacket nest. The entrance to the tunnel is at ground level, in between blades of green grass.  The tunnel goes down into the brown dirt until it forms a large round space. Inside the space is the nest, which is connected to the wall of the hole by being connected to a root. The inside of the nest has dozens/hundreds/thousands of little cells for the queen yellowjacket to lay eggs in. The cells are surrounded by a covering that protects the nest. The nest can be entered through a hole in the bottom of the nest.
An underground yellowjacket nest

Yellowjacket activity is high this year 

Over the past 20 years, we have responded to more than 15,300 calls about yellowjackets.  Yellowjacket nest control is an important part of public health vector control because reactions to stings can sometimes be life-threatening. And unlike bees, they can sting more than once and can also bite.

Yellowjackets usually nest underground in holes, dense vegetation, and woodpiles. If you can locate the yellowjacket nest, we can treat or remove the nest at no charge. Look for nests during mid-day when yellowjackets are flying in and out. When you find a nest, call us at 650-344-8592 or submit a service request HERE.

West Nile Virus 2023 Season

Computer generated image of a silhouette of five birds on their backs (dead)

As of September 13, West Nile virus has been detected in 5 dead birds from throughout San Mateo County.  West Nile virus has not yet been detected in any mosquito or sentinel chicken samples in San Mateo County in 2023. Learn more HERE.

West Nile virus is widespread throughout California this summer. If you are traveling, even within the state, be sure to use insect repellent to prevent mosquito bites (read more below). For information about West Nile virus throughout California, visit


Protect yourself from mosquito bites

Computer-generated image of an orange spray pump bottle with an icon of the mosquito on the front with a red circle and line through the mosquito. The bottom of the bottle has text reading "EPA Reg. No. 1234-567" with an arrow pointing to the text.
An EPA-registered repellent has a number listed on the container.

This summer, San Mateo County residents experienced unusual rain events and weeks of alternating hot and cool days. Our weather may be uncertain, but one thing remains the same… mosquitoes are out to bite! In the warmer summer and fall months, mosquitoes are more likely to transmit diseases like West Nile virus, so it’s important to protect yourself whether at home or while traveling. Here are some mosquito bite prevention tips:

  • Use mosquito repellent that is EPA-registered. This is your guarantee that the product is safe and effective. Learn more HERE.
  • Wear long-sleeved shirts, long pants, and socks to cover exposed skin.
  • Ensure doors and windows are screened to keep mosquitoes out of your living spaces.
  • Eliminate standing water around your home, as it serves as a mosquito breeding site.


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