Mosquitoes used to be a seasonal nuisance in Los Angeles. That changed when invasive Aedes mosquitoes established themselves across Southern California. These aggressive daytime biters breed in tiny amounts of water, thrive in urban environments, and can transmit serious diseases. For LA property owners and managers, mosquito control is no longer just about comfort. It's about health.
Southern California's warm climate and limited rainfall might seem like poor conditions for mosquitoes, but LA's irrigation systems, swimming pools, neglected fountains, and container clutter provide more than enough standing water to sustain large mosquito populations year-round.
The Greater Los Angeles County Vector Control District has documented a dramatic increase in invasive Aedes mosquito populations since they were first detected in the region. These mosquitoes are now established in communities across LA County, Orange County, and the Inland Empire, and they behave very differently from the native species most residents are familiar with.
These are the mosquitoes most Angelenos grew up with. They're most active at dawn and dusk, breed in larger bodies of standing water like neglected pools and storm drains, and are the primary carriers of West Nile virus in Southern California. LA County reports West Nile virus activity every year, with cases typically peaking between July and October.
Key fact: West Nile virus has been detected in mosquito populations across Los Angeles County every year since 2003. Most infections produce mild or no symptoms, but severe cases can cause neurological illness. People over 50 and those with compromised immune systems are at highest risk, which matters for senior living and care facilities.
The Aedes aegypti (yellow fever mosquito) and Aedes albopictus (Asian tiger mosquito) are the species reshaping mosquito control in LA. Unlike native mosquitoes, Aedes mosquitoes bite aggressively during the day, prefer to feed on humans over animals, and can breed in a container as small as a bottle cap filled with water.
These species are capable of transmitting dengue, Zika, and chikungunya, diseases that were previously not a local concern. While large-scale outbreaks have not occurred in LA, the presence of competent vectors means the risk is real, especially as global travel brings infected individuals through the region.
How to tell them apart: Aedes mosquitoes are small, black with distinct white stripes on their legs and body. If you're getting bitten during the daytime, especially around your ankles and lower legs, you're likely dealing with Aedes.
Eliminating breeding sites is the most effective form of mosquito control. Mosquitoes don't travel far from where they hatch, so reducing standing water on the property directly reduces the mosquitoes biting residents and staff. Here are the most common breeding sources on LA properties:
Source elimination comes first. No spray, trap, or repellent is as effective as removing standing water. Walk the entire property once a week and dump, drain, or scrub anything holding water. Pay special attention to shaded areas where water evaporates slowly.
Mosquito dunks for water you can't drain. Bacillus thuringiensis israelensis (Bti) dunks are biological larvicides that kill mosquito larvae without harming fish, pets, birds, or beneficial insects. Drop them into ornamental ponds, rain barrels, or any water feature you can't empty. They last about 30 days each.
Fans in outdoor common areas. Mosquitoes are weak fliers. A simple oscillating fan on an outdoor seating area makes it dramatically harder for them to land and bite. This is one of the most underrated mosquito deterrents.
Maintain the landscaping. Mosquitoes rest in dense vegetation during the heat of the day. Keep shrubs trimmed, mow regularly, and clear leaf litter from shaded areas near the building. Reducing resting habitat makes the property less hospitable.
When basic efforts aren't enough, especially during peak season or if you're dealing with a heavy Aedes population, professional mosquito control provides an additional layer of protection.
A licensed technician applies a residual product to vegetation, fence lines, under eaves, and other mosquito resting areas around the property perimeter. This creates a barrier that kills or repels adult mosquitoes on contact. Treatments typically last three to four weeks and are most effective when combined with source reduction.
For properties with water features, drainage issues, or breeding sites that can't be fully eliminated, targeted larvicide treatments prevent mosquito larvae from developing into biting adults. This is especially important for properties near channels, storm drains, or areas with persistent moisture.
Mosquito pressure in LA runs roughly March through November, with peak activity from June through September. A recurring monthly or bi-monthly program during these months keeps populations suppressed and gives you consistent protection throughout the season.
Important: Mosquito control is most effective as a neighborhood effort. If neighboring properties have neglected pools, unmaintained yards, or heavy container clutter, mosquitoes breeding there will still reach yours. Consider contacting your local vector control district to report neglected swimming pools.
Squash Exterminating provides mosquito control for apartment communities, care facilities and commercial properties across Los Angeles County and Orange County. We'll inspect the property for breeding sites, apply targeted treatments, and set you up on a seasonal program that keeps mosquitoes under control.
Call us at (323) 855-3567 or email rikki@squashpestca.com to schedule a free property assessment.
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