Short Bites Monthly

Your digest for August 2025.

A hand holds a phone showing a mosquito with "August Update" text beside it.

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

People at an outdoor event, children interacting with a display box, supervised by adults. — *Image from the Mosquito Bros Challenge, where participants place their arms inside a cage filled with non-biting male mosquitoes.*

Mosquito season is in full swing in the San Gabriel Valley.
As temperatures rise and mosquito populations increase, our district remains committed to protecting your community through targeted, strategic treatments.

Mosquitoes are persistent, but so are we.
We’re calling on the community to join the fight. Follow these three simple steps to help reduce mosquito sources and bites:

Tip out stagnant water to prevent mosquitoes from growing around your home.
Toss unused containers that can collect water and attract mosquitoes.
Protect yourself and your loved ones by using insect repellent to stop the bite before it happens.

DID YOU KNOW?
Mosquitoes can go from egg to full-grown, biting adults in just 5 to 7 days! That’s why it’s so important to act fast and stay consistent with prevention.

Tip water, toss containers, protect with repellent.

Remember: Tip. Toss. Protect.
Together, we can keep our community safe.

Outreach Overview

Mosquito Activity

A map showing clusters of blue dots around Pasadena, West Covina, and Pomona, with highways and city names labeled. — *Image of this month's mosquito activity by latitude and longitude. Bubble size indicates mosquito abundance per trap.*

Pie chart showing mosquito species distribution: Cx quinquefasciatus 70.31%, Ae aegypti 13.62%, Cx erythrothorax 8.53%, others less. — *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**.

Two people wading in a river with a mountainous backdrop and lush greenery. — *Image of Vector Control Technicians applying Black Fly treatment to the San Gabriel River.*

In our foothill communities, mosquitoes aren’t the only vectors to be aware of.
Another small biting insect, the black fly, is a growing nuisance in these areas. Known for targeting the face and neck with painful, itchy bites, black flies thrive in the foothills due to their preference for breeding in running water.

Much like mosquitoes, our team of trained technicians is actively treating the foothill areas to reduce black fly populations. However, their breeding sites are often influenced by natural sources and essential infrastructure that are beyond our control.