Mosquito Control in the GT

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 Problem

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.

What is a Larvicide? Larvicide is a targeted ecological treatment applied directly to standing water to kill mosquito larvae before they can mature into biting adults. Modern larvicides are highly specific to mosquitoes and do not harm fish, birds, pets, or beneficial aquatic insects.

Industry Fast Facts:

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.
The mosquito lifecycle from egg to biting adult takes just 8–10 days during peak summer heat.
Only female mosquitoes bite. They require the protein from blood to develop their eggs. Male mosquitoes strictly feed on flower nectar.

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

Common Mosquito

Mosquito Species Active in Ontario

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

Culex Mosquitoes (Culex pipiens / Culex restuans)

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

Breeding Sites: 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.

Aedes Mosquitoes (Aedes albopictus / Aedes vexans)

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

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

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

Floodwater Mosquitoes (Aedes canadensis / others)

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

Outdoor comfort

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.

Mosquito Attract

What Attracts Mosquitoes to Your Property

Understanding what draws mosquitoes to your specific property helps us eliminate the conditions — not just the insects:

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Standing water

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

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Dense vegetation

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

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Overgrown gutters

Clogged gutters hold pooled water for weeks after rainfall

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Shaded, low areas

Low spots in lawns that pool water after rain

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Uncovered water features

Bird baths, decorative ponds, water trays under planters

Our Mosquito Treatment Process

How Pestisect Treats Mosquitoes

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.

Service Areas for Mosquito Control

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Mosquito Control Toronto

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Mosquito Control Brampton

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Mosquito Control Mississauga

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.

Take Back Your Outdoor Space This Season

Don’t let mosquitoes take over your home or business. Contact our expert mosquito control specialists today for a detailed inspection and a customized treatment plan.