Short Bites Monthly

Your digest for September 2025.

Hand holding smartphone with a mosquito image, next to text "September Update" on blue background.

This Short Bites Monthly e-blast shares insight into the past year’s activity. This ensures that our data as a public health agency remains transparent to the public and to people who are interested in our mission.

May contain: pickup truck, transportation, truck, vehicle, person, clothing, footwear, and shoe — **We continue to provide the highest level of protection from vectors and vector-borne diseases to reduce outbreaks of human diseases in San Gabriel Valley.**

District Communication

A group attends a presentation at Bassett Senior Center with decorations and a screen displaying information. — *Image from a community presentation at Bassett Park informing residents about the launch of our new program, SGV Mosquito Match.*

Fall Is Here, But the Bugs Didn't Get the Memo

Even with cooler weather arriving, mosquitoes and black flies are still a concern. Our communities are currently seeing a high number of black flies, which are a nuisance but don't transmit disease in LA County. Mosquitoes, however, can still carry dangerous viruses like West Nile virus and Dengue.

We are actively monitoring and treating public mosquito and black fly breeding sites.

You can help by:

Tip & Toss Stagnant Water: Eliminate anything that can hold water to prevent mosquito breeding once a week.
Managing Black Fly Sources: Temporarily turn off fountains or water features for 24 hours once a week to disrupt black fly breeding.
Use Mosquito Repellent: Apply mosquito repellent whenever you’re outside to prevent bites. Need protection from mosquitoes & black flies? Make sure that your repellent contains the active DEET ingredient.

Your Community Investment at Work

As a friendly reminder, our services are already covered by your property taxes, so there is no additional cost to you. Your investment directly supports our mission to protect public health. We offer a variety of free services to help our community, including:

Together, we can continue to keep our neighborhoods safe and healthy.

Outreach In Your Community

Mosquito Activity In Your Community

A map showing the Los Angeles area with various-sized blue circles indicating data points or locations. — Image of this month's mosquito activity by latitude and longitude. Bubble size indicates mosquito abundance per trap.

Line graph showing average mosquitoes per trap by week for 2021-2025, with varying yearly trends. — Image of weekly mosquito activity across the San Gabriel Valley compared to previous years, see 2025 data in red.

Pie chart showing mosquito species distribution: Cx quinquefasciatus 79.56%, Ae aegypti 11.28%, others smaller percentages. — Image of this month’s mosquito trap collection by species throughout San Gabriel Valley.

May contain: animal, insect, invertebrate, and mosquito — **We continue to maintain essential vector surveillance including mosquito traps for disease testing, providing weekly data to** **the District, and maintaining** **mosquito fish**.

Eaton Area Resonse

Man walking on dirt path with a bucket, wearing gloves, with mountains and trees in the background. — Image of a Vector Control Technician controlling mosquito larvae and pupae in Eaton burn zone pools.

We have just completed our second round of proactive mosquito control treatments as part of our ongoing response in the Eaton area.

Our crews are actively targeting high-risk mosquito breeding sites, including both full and empty pools that were impacted by the recent wildfires. These treatments are essential to prevent mosquitoes from multiplying by the millions, which significantly reduces the risk of mosquito-borne diseases in the community.

May contain: animal, insect, and invertebrate — **We continue to provide excellent** **science education** **services and** **reduce mosquitoes in homes and schools** **within the San Gabriel Valley.**

EcoHealth Vector Education

A teacher reads to children seated on small chairs in a classroom. — Image of a Communications Outreach Assistant leading a Little Champions Preschool Program in Alhambra.

Ready to spark some curiosity and empower your students with champion-level habits?

Our Little Champions Preschool program makes learning about science and bite-free living an absolute blast, all while getting them ready for kindergarten. Spots are filling up fast! Don't miss out. Secure your program before the year is over!