New Jersey Mosquito Identification Guide
Learn the visual and behavioral clues that separate Asian tiger, northern house, and Asian bush mosquitoes — three species New Jersey homeowners commonly encounter.
The Three Mosquitoes That Matter in New Jersey Yards
New Jersey has more than 60 mosquito species, but in backyards — as opposed to salt marshes and deep woods — three do the vast majority of the biting: the Asian tiger mosquito, the northern house mosquito, and the Asian bush mosquito. Two of the three are invasive species that arrived in the last few decades and made themselves very much at home. Learning to tell them apart helps you choose the right prevention for each.
Key fact: only female mosquitoes bite — they need blood to develop their eggs. Males feed on nectar and never bite. If it is biting you, it is a female.
Asian Tiger Mosquito — Aedes albopictus
The small, aggressive daytime biter behind most NJ backyard complaints. If mosquitoes are biting your ankles at a 2 p.m. barbecue, this is almost certainly the culprit.
What it looks like
- Small (about 1/4 inch), jet black with striking white markings.
- A single white stripe down the middle of the back — the easiest field mark.
- White bands on the legs, giving a “striped stockings” look.
When and where it bites
Daytime — most active in early morning and late afternoon, but it will bite all day in shade. It flies low and quiet, which is why bites seem to come out of nowhere, often around the ankles and lower legs.
Where it breeds
Almost anything that holds a little water: saucers, buckets, toys, tarps, clogged gutters, tires, birdbaths, even a bottle cap. It flies less than 200 yards in its life, so if tiger mosquitoes are biting you, they were almost certainly born in your yard or your immediate neighbor’s.
Diseases it can carry
In the U.S., the Asian tiger mosquito is a potential vector for West Nile virus, Eastern equine encephalitis, dengue, chikungunya, and Zika — though local transmission of the tropical diseases is not established in NJ. Its main offense here is relentless biting.
Northern House Mosquito — Culex pipiens
The classic dusk-and-night biter and New Jersey’s primary West Nile virus vector. This is the mosquito whining in your ear at bedtime.
What it looks like
- Medium-sized, plain brown with no dramatic markings — the “generic mosquito” look.
- Blunt-tipped abdomen; at rest it holds its body parallel to the surface.
When and where it bites
Dusk through the night. It feeds mainly on birds (which is how West Nile virus circulates) but readily bites people in the evening. Peak West Nile risk in NJ runs August through September.
Where it breeds
Nutrient-rich stagnant water: storm drains, catch basins, neglected pools, ornamental ponds, and containers with decaying leaves. It will travel farther than the tiger mosquito — up to a mile or more.
Diseases it can carry
- West Nile virus — the main one in NJ; most infected people have no symptoms
- St. Louis encephalitis — rare
Asian Bush Mosquito — Aedes japonicus
Another invasive container-breeder, established in New Jersey since the late 1990s. Larger and browner than the tiger mosquito, and active earlier in the season.
What it looks like
- Larger than the tiger mosquito, brown/bronze rather than black and white.
- Lyre-shaped bronze markings on the back; banded legs but less dramatically than the tiger mosquito.
When and where it bites
Evenings and at night, and it tolerates cooler spring weather better than the tiger mosquito — so it is often the first biter of the season. It breeds in the same kinds of containers as the tiger mosquito, including rock pools and tree holes.
Diseases it can carry
A competent laboratory vector of West Nile virus and La Crosse encephalitis. In practice, its biggest impact in NJ is as an early-season nuisance biter.
Quick Comparison
- Black with a white racing stripe, bites in daytime: Asian tiger mosquito
- Plain brown, whines at dusk: northern house mosquito
- Big, bronze, bites on spring evenings: Asian bush mosquito
- Breeds in your saucers and gutters: tiger and bush mosquitoes
- Most linked to West Nile in NJ: northern house mosquito
Quick Answers
What does an Asian tiger mosquito look like?
Small and black with a single white stripe down the middle of its back and white bands on its legs. It bites aggressively during the daytime, often around the ankles.
Do all mosquitoes in New Jersey bite during the day?
No. The Asian tiger mosquito is the daytime specialist. The northern house mosquito bites mostly at dusk and through the night, and the Asian bush mosquito bites in the evening and at night.
Why are there so many mosquitoes in my yard but not my neighbor’s?
Most biting mosquitoes breed very close to where they bite. If your yard has standing water — clogged gutters, saucers, tarps, birdbaths — you are likely breeding your own mosquitoes. Ten minutes of tip-and-toss each week usually fixes it within a week or two.
What to Do Next
Now that you know your mosquitoes, take away their nurseries with the Seasonal Yard Mosquito Checklist, learn what actually works in Natural Mosquito Control: What Actually Works, and see What to Do After a Mosquito Bite for bite care.
This guide is for educational purposes only and isn't medical or veterinary advice. If you've been bitten or have symptoms, contact your doctor, veterinarian, or local health department.