Northern House Mosquito
Culex pipiens
Anatomy
Identification
Distinguishing Features
- Long proboscis for blood-feeding
- Wings with scales along veins
- Rests with body parallel to the surface (diagnostic posture)
- Brownish/drab overall coloration (compared to boldly striped Asian Tiger Mosquito)
- Pale bands on abdomen segments
Biology
Lifecycle
Unlike mosquito species that lay eggs singly, Culex lays eggs in a floating 'raft' of 100-300 eggs—resembling a speck of soot on the water surface. Egg rafts → larvae (wrigglers) → pupae (tumblers) → adults. Complete cycle in 10-14 days in warm weather.
Diet
Females require blood meals for egg production. Both sexes feed on nectar. Prefer birds but bite humans.
Nesting
Breed in strictly stagnant water rich in organic matter. A forgotten cup of water in the backyard is sufficient breeding habitat—they don't need a pond. Common sites: catch basins, bird baths, clogged eavestroughs, discarded tires, unused pools, and any water-holding container. Thrives in urban environments.
Signs of Infestation
Mosquitoes indoors at dusk
Adults entering through gaps to feed, especially in bedrooms.
Bites appearing overnight
Itchy welts on exposed skin after sleeping.
Wrigglers in standing water
Larvae visible in bird baths, buckets, or clogged gutters.
High-pitched whining
Wing beat frequency creates distinctive sound near ears.
Where They Nest
- Catch basins and storm drains
- Clogged roof gutters
- Bird baths and ornamental ponds
- Discarded tires and containers
- Unused pools and hot tubs
Distribution in Canada
Abundant in urban areas across southern Canada. Primary nuisance and disease vector.
Active Season
Crepuscular (most active at dusk and dawn) and nocturnal—they create the high-pitched whine heard in bedrooms at night. Active May-September outdoors. Unlike many mosquito species that die off, Culex females can overwinter as adults in basements, sewers, crawl spaces, and other sheltered locations in Canada.
Prevention
- Eliminate standing water weekly (dump, drain, or cover)
- Clean gutters regularly
- Stock ornamental ponds with mosquitofish
- Use screens on windows and doors
- Apply larvicide to catch basins (municipal programs)
Professional Treatment
Barrier spray treatments on vegetation reduce adult resting sites. Larviciding in breeding areas. Most effective as part of integrated municipal program.
Get Mosquito Control ServiceFrequently Asked Questions
What does a Northern House Mosquito eat?
Females require blood meals for egg production. Both sexes feed on nectar. Prefer birds but bite humans.
Where does a Northern House Mosquito nest?
Breed in strictly stagnant water rich in organic matter. A forgotten cup of water in the backyard is sufficient breeding habitat—they don't need a pond. Common sites: catch basins, bird baths, clogged eavestroughs, discarded tires, unused pools, and any water-holding container. Thrives in urban environments.
When is a Northern House Mosquito most active?
Crepuscular (most active at dusk and dawn) and nocturnal—they create the high-pitched whine heard in bedrooms at night. Active May-September outdoors. Unlike many mosquito species that die off, Culex females can overwinter as adults in basements, sewers, crawl spaces, and other sheltered locations in Canada.
What are the signs of a Northern House Mosquito infestation?
Mosquitoes indoors at dusk: Adults entering through gaps to feed, especially in bedrooms. Bites appearing overnight: Itchy welts on exposed skin after sleeping. Wrigglers in standing water: Larvae visible in bird baths, buckets, or clogged gutters. High-pitched whining: Wing beat frequency creates distinctive sound near ears.
How can I prevent a Northern House Mosquito infestation?
Eliminate standing water weekly (dump, drain, or cover). Clean gutters regularly. Stock ornamental ponds with mosquitofish. Use screens on windows and doors. Apply larvicide to catch basins (municipal programs).
How is a Northern House Mosquito treated?
Barrier spray treatments on vegetation reduce adult resting sites. Larviciding in breeding areas. Most effective as part of integrated municipal program.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Diptera
- Family
- Culicidae
- Genus
- Culex