How many mosquito treatments do I need per season?

For consistent protection, Pestisect recommends 3–4 applications per season — approximately every 3–4 weeks from late May through early September.

Mosquito Control in Toronto, Brampton & Mississauga

Q: What time of year are mosquitoes worst in Ontario?

Mosquitoes are active May through October in the GTA, peaking in July and August. Floodwater mosquitoes can appear earlier in spring after snowmelt.

Q: Can mosquitoes breed in my backyard?

Yes. Any standing water lasting more than 3–4 days can become a breeding site — including flower pot saucers, clogged gutters, bird baths, low lawn spots, and outdoor containers.

Small insects. Big disruption. Serious health risk. Here’s what you need to know — and what Pestisect does about it.

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Mosquito Control

Why Mosquitoes Are a Serious Problem in the GTA

Ontario mosquitoes aren’t just a summer nuisance. Culex mosquitoes in the Greater Toronto Area are confirmed carriers of **West Nile Virus**, which the province actively monitors each season. Beyond public health, mosquito pressure in urban and suburban areas dramatically reduces enjoyment of outdoor spaces, impacts business patio revenue, and creates real discomfort for residents and their families.

A single female mosquito can lay up to **300 eggs in a single batch** — in as little water as a puddle on a plastic bag. With a lifecycle of just 8–10 days from egg to biting adult, populations compound rapidly through the warm months.

Professional mosquito control targets both the adult population and the breeding cycle — the only way to achieve meaningful, lasting reduction.

Common Mosquito Types

Mosquito Species Active in Ontario

Different species require different treatment approaches. Precise identification guides our source control targeting:

Culex Mosquitoes

Size: 4–7mm

Appearance: Light to dark brown, unmarked

Behaviour: Primarily nocturnal; most active from dusk to dawn. Common in urban and suburban areas throughout the GTA.

Breeding Site: Stagnant water in drains, clogged gutters, garden pots, rain barrels, and neglected pools or water features

Health Risk: Primary West Nile Virus vector in Ontario. The province conducts annual Culex monitoring across the GTA.

Peak Season: June through September

Aedes Mosquitoes

Size: 3–6mm

Appearance: Black with distinctive white banding on legs and body

Behaviour: Aggressive daytime biters — unlike Culex, they are active throughout the day. Found around homes, gardens, and patio areas.

Breeding Site: Extremely small water sources — bottle caps, flower pot saucers, old tires, children’s toys, uncovered tarps

Health Risk: Aedes species are vectors for multiple diseases globally; Aedes vexans is the primary nuisance biting mosquito in Ontario

Peak Season: JMay through October

Anopheles Mosquitoes

Size: 5–8mm

Appearance: BBrown with spotted wings; hold their body at a distinctive angle when resting

Behaviour: Active at dusk and dawn; found near natural water bodies — ponds, marshes, stream edges

Breeding Site: Natural water-body margins with minimal current — edges of ponds, marshy ground, slow-moving water

Health Risk: Primary malaria vector globally; locally, less significant than Culex for disease risk

Peak Season: July through August

Floodwater Mosquitoes

Size: 6–10mm — among the largest mosquitoes in Ontario

Appearance: Dark brown with golden markings

Behaviour: Strong fliers — can travel up to 15km from breeding sites. Aggressive biters, active during daylight hours. Appear in large numbers 5–7 days after significant rainfall or snowmelt.

Breeding Site: Temporary pools from heavy rain, snowmelt, or flooding — low lawn areas, ditches, open land

Peak Season: Spring (post-snowmelt) and after heavy summer rainstorms

Why Mosquito Control

Why Outdoor Comfort and Business Usability Matter

For Homeowners

Mosquito pressure during June–September effectively eliminates outdoor living. Evenings on the deck, children playing in the garden, weekend barbecues — all become uncomfortable and impractical without intervention.

For Restaurants & Patios

Outdoor dining revenue is directly tied to the comfort of the dining experience. One mosquito-heavy evening drives customers inside — or to a competitor across the street. Seasonal mosquito programs are one of the best investments GTA restaurant owners can make for patio revenue.

For Property Managers

Shared outdoor areas — pool decks, courtyards, resident gardens — generate mosquito complaints when unmanaged. Proactive seasonal treatment reduces tenant complaints and supports positive property reviews.

Poorly maintained pools

Even a slightly neglected pool edge can harbour larvae

Tarps and covers

Any cover that catches rainwater underneath

mosoquitoes Attract

What Attracts Mosquitoes to Your Property

Standing water

Any accumulation lasting more than 3–4 days becomes a breeding site

Dense vegetation

Mosquitoes rest in cool, shaded, moist foliage during the day

Overgrown gutters

Clogged gutters hold pooled water for weeks after rainfall

Shaded, low areas

Low spots in lawns that pool water after rain

Uncovered water features

Bird baths, decorative ponds, water trays under planters

Why Mosquito Control Matters

Mosquitoes can disrupt outdoor comfort and may also raise health concerns depending on the environment. Their ability to breed quickly makes early control important. Without proper treatment, mosquito populations can increase rapidly, making outdoor spaces difficult to use.

Professional mosquito control helps manage active populations and reduce the chances of future infestations.

OUr mosquito Control Process

How Pestisect Treats Mosquitoes

Our systematic approach ensures complete elimination of Mosquito

Property Inspection

We walk the full property identifying standing water sources, breeding sites, dense resting vegetation, and structural conditions contributing to mosquito pressure.

Source Elimination

We eliminate or treat every identified breeding site. Non-removable water features (such as permanent ponds) are treated with larvicide that kills larvae without harming fish, birds, or beneficial insects.

Barrier Spray Application

A targeted residual spray is applied to the underside of foliage, shaded areas, fence lines, and perimeter vegetation where adult mosquitoes rest. This knocks down the adult population immediately and continues working for 3–4 weeks.

Prevention Guidance

We provide specific, property-level recommendations for ongoing prevention — drainage improvements, vegetation management, water feature maintenance — that extend protection between treatments.

Areas We Serve

Service Areas for Mosquito Control

Mosquito Control in Toronto

Mosquito Control in Brampton

Mosquito Control in Mississauga

Related services:

All Pests We Treat

Mosquito Control Service

Frequently Asked Questions — Mosquitoes

What time of year are mosquitoes worst in Ontario?

Mosquitoes are typically active May through October in the GTA, with peak activity in July and August. Floodwater mosquitoes can appear in large numbers earlier in spring after snowmelt.

Can mosquitoes breed in my backyard?

Yes. Any standing water that persists for more than 3–4 days can become a mosquito breeding site. This includes flower pot saucers, low lawn areas, clogged gutters, bird baths, tarps, and any small container left outdoors.

How many treatments do I need per season?

For consistent protection through the mosquito season, we recommend 3–4 applications — timed approximately every 3–4 weeks from late May through early September.

Will mosquito treatment affect bees or butterflies?

Our barrier spray is applied specifically to shaded vegetation and fence lines where mosquitoes rest — not to flowering plants where pollinators feed. We also time applications for early morning or evening when pollinator activity is lowest, further reducing any potential exposure.

Can I do anything to reduce mosquitoes myself before treatment?

Yes. Eliminating standing water is the single most effective DIY action. Empty any container holding water, clean your gutters, change bird bath water every 3–4 days, and fill low spots in your lawn that pool after rain. Combine this with professional treatment for the best results.

Take Back Your Outdoor Space This Season

If mosquitoes are making your outdoor space uncomfortable, Pestisect Pest Control is ready to help. Contact us today for effective mosquito control services and enjoy your property again.