Pests We Treat in Toronto, Brampton & Mississauga

Q: How do I know if I have bed bugs or just mosquito bites?

Bed bug bites appear in lines or clusters on skin exposed during sleep. They leave rust-coloured spots on mattress seams and shed exoskeleton. Mosquito bites are more random. If unsure, call Pestisect for a professional inspection.

Q: What is the difference between carpenter ants and termites?

Carpenter ants are black or reddish-black with a pinched waist; they tunnel through wood but don't eat it. Termites are pale, soft-bodied, and eat wood. Carpenter ants shed wings seasonally; termites swarm in groups.

Q: Are cockroaches a sign of an unclean home?

No. German cockroaches — the most common indoor species in Ontario — are typically transported into homes through grocery bags and cardboard boxes, not through poor hygiene.

Expert identification and professional treatment for every pest found in Ontario homes and businesses.

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Learn About the Pests We Handle

Know Your Pest, Know Your Solution

Effective pest control starts with accurate identification. Different pest species require completely different treatment methods — what eliminates cockroaches won’t touch bed bugs, and misidentifying an ant species can result in a treatment that drives them deeper into walls rather than eliminating them.

Pestisect’s licensed technicians are trained to identify every pest species common to the Greater Toronto Area — not just visually, but by their behaviour, nesting patterns, and entry preferences. This allows us to apply the right treatment the first time.

Use the guide below to identify what you’re dealing with, then contact us for a professional assessment.

Identify

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Common Household Pests

Common Pests in the GTA

Click on any pest below to learn more about identification, behavior, and control methods.

Ants

Species in Ontario: Pavement Ants, Carpenter Ants, Pharaoh Ants

Signs: Trails leading to food sources, sandy mound near foundation (pavement ants), wood shavings near timber (carpenter ants)

Risk: Carpenter ants cause structural damage by tunnelling into moist wood; Pharaoh ants are extremely difficult to eliminate without professional treatment

Best Action: Species-specific baiting and targeted residual treatment

Mosquito

Species: Culex, Aedes, Anopheles, Floodwater Mosquitoes

Signs: Bites — especially at dawn, dusk, and night; buzzing sounds outdoors; standing water on the property

Risk: West Nile Virus transmission; severe outdoor nuisance reducing quality of life and business usability

Best Action: Source elimination + barrier spray + larvicide treatment

Bed Bugs

Signs: Rust-coloured blood spots on mattress seams, shed exoskeletons, bites in lines or clusters, sweet musty odour in heavy infestations

Risk: Rapid spread through shared walls, furniture, and clothing — one female lays up to 500 eggs in her lifetime

Best Action: Heat treatment and/or chemical treatment targeting all life stages — eggs, nymphs, and adults

Bees/Wasps

Species: Yellow Jackets, Paper Wasps, Bald-Faced Hornets, Honey Bees

Signs: Papery grey nest in eaves, walls, or attic; increased wasp activity near a specific spot; underground nest entrance in yard

Risk: Wasp stings trigger severe allergic reactions (anaphylaxis) in some individuals; aggressive species attack without warning when disturbed

Best Action: Professional nest removal — disturbing a nest without protection is dangerous

Cockroaches

Species in Ontario: German Cockroach (most common), American Cockroach, Oriental Cockroach

Signs: Droppings (look like coffee grounds), shed skins, egg casings, musty odour, greasy smear marks near baseboards

Risk: Cockroaches carry 33 types of bacteria including Salmonella and E. coli, triggering asthma and allergies

Best Action: Professional gel bait and residual treatment — cockroaches develop resistance to store-bought products rapidly

Mice/Rats

Species: Norway Rat (sewer rat), Roof Rat, House Mouse, Deer Mouse

Signs: Droppings along walls, gnaw marks on food packaging and wood, scratching sounds at night, nesting material in hidden areas

Risk: Structural damage from gnawing on wiring (fire risk), contamination of food and surfaces, disease transmission (Hantavirus in mice, Leptospirosis in rats)

Best Action: Trapping + exclusion sealing — poison baiting alone without sealing guarantees re-infestation

Spiders

Species: Common House Spider, Wolf Spider, Cellar Spider, Orb Weaver

Signs: Webs in corners, along window frames, and in basement areas; egg sacs in hidden locations

Risk: Most Ontario spiders are harmless, but bites from some species cause irritation; heavy infestations indicate a larger underlying pest problem (spiders follow their food source)

Best Action: Perimeter spray + addressing the underlying prey insect population

Silverfish

Signs: Irregular holes in paper, books, wallpaper, and fabric; silver-grey fish-shaped insects found in damp, dark areas

Risk: Property damage to books, documents, wallpaper, clothing, and stored goods; indicator of high humidity conditions favouring other pests

Best Action: Dehumidification guidance + residual spray in affected areas

Centipede/Millipede

Species: Centipedes & Millipedes

Signs: Found in damp areas like basements, bathrooms, and under sinks; fast-moving (centipedes) or slow curled (millipedes)

Risk: Mostly harmless but can be disturbing; centipedes may bite if handled

Best Action: Reduce moisture + seal entry points + apply perimeter treatment

Clover Mites

Species: Clover Mites

Signs: Tiny red bugs on windowsills and walls; leave red stains when crushed

Risk: Harmless to humans but become a nuisance in large numbers

Best Action: Exterior barrier treatment + sealing cracks around windows/doors

Moths

Species: Clothes Moths (Webbing, Casemaking)

Signs: Small holes in clothes; larvae in dark closets; silky webbing on fabrics

Risk: Damage to natural fabrics like wool, silk, and carpets

Best Action: Deep cleaning + vacuuming + storing clothes in sealed containers + targeted treatment

Flies

Species: Fleas (Cat Flea, Dog Flea)

Signs: Pets scratching excessively; tiny black droppings (flea dirt) on pet bedding; bites on ankles/legs

Risk: Cause itching, allergic reactions, and can spread diseases; fast reproduction leads to quick infestation

Best Action: Treat pets + indoor treatment (carpets, bedding) + outdoor yard control

Box Elder Bugs

Species: Box Elder Bugs

Signs: near windows, doors, and sunny walls; black bugs with red lines

Risk: Harmless but invade homes in large numbers during seasonal changes

Best Action: Exterior perimeter spray + sealing entry points

Beetles

Species: Beetles (Grain, Flour, Carpet)

Signs: Found in pantry items, carpets, or fabric; larvae in stored food or fibers

Risk: Contaminate food and damage fabrics

Best Action: Remove infested items + deep cleaning + storage in airtight containers + targeted pest control

Flies & Fruit Flies

Species: Flies & Fruit Flies

Signs: Small flies around garbage, drains, or fruits; rapid increase in numbers

Risk: Spread bacteria and contaminate food

Best Action: Remove food sources + clean drains + use traps + sanitation + residual treatment

Note: Don’t see your pest listed? Call us at (647) 924-2753 — if it’s a pest in Ontario, we’ve treated it.

Pest Identification Matters

Why Different Pests Need Different Treatments

Not all pests behave the same way, and not every infestation can be solved with a general treatment approach. Some pests hide deep inside walls or furniture, while others nest outdoors and enter through small gaps and openings.

Proper identification helps determine where pests are active, how serious the infestation may be, and which treatment method is most effective. That is why professional inspection and targeted service are important for better long-term results.

Pest Identification FAQ

How do I know if I have bed bugs or just mosquito bites?

Bed bug bites typically appear in lines or clusters on skin exposed during sleep (arms, shoulders, neck, legs). Mosquito bites are more randomly distributed and usually accompanied by immediate swelling. Bed bugs leave rust-coloured spots on mattress seams and shed their exoskeleton as they grow. If you suspect bed bugs, do not wait — call us for a professional inspection.

What's the difference between carpenter ants and termites?

Carpenter ants are black or reddish-black and have a pinched waist; they tunnel through wood but do not eat it. Termites are pale, soft-bodied, and eat wood. Carpenter ants shed wings seasonally; termites swarm in large numbers. If you see large black ants or shed wings near wood structures, contact us immediately.

Why do I keep getting ants every summer?

Warm weather activates ant colonies and sends scouts searching for food. If ants return annually, it indicates an established outdoor colony near your foundation with reliable access points into your home. A professional treatment addresses both the colony and the entry points.

Are cockroaches a sign of an unclean home?

No. German cockroaches (the most common indoor species) are transported into homes through grocery bags, cardboard boxes, and second-hand appliances — not through poor hygiene alone. Once inside, they multiply rapidly regardless of cleanliness. An infestation is not a reflection on the homeowner.

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