BuzzSkito Mosquito & Tick Control Specialists · Published April 1, 2026
Quick Answer
Professional barrier spray is the only approach that treats the resting surfaces across an entire Ontario yard — a residual on shaded vegetation lasting up to 30 days per treatment. DIY tools like citronella, foggers, and DEET are useful supplements, not substitutes. Nothing here clears a yard; mosquitoes disperse back in from surrounding properties.
- Citronella candles reduce mosquito landings by only 11–42%, and only within about 1 metre of the flame.
- Consumer foggers and hose-end sprays last 1–7 days; professional barrier spray lasts up to 30 days.
- DEET protects the wearer's skin but does nothing to reduce the yard's mosquito population.
- BTI mosquito dunks kill larvae in standing water for about 30 days and are harmless to pets, birds, and fish.
- A Thermacell creates roughly a 6-metre repellent zone around a seated area — effective for a patio table, useless for a whole yard.
- Professional barrier spray starts from $99 per treatment and leaves a residual on the shaded vegetation where mosquitoes rest during the day.
— BuzzSkito, GTA mosquito & tick control · 150+ five-star Google reviews
We're a mosquito control company — so take our perspective with that in mind. But the evidence strongly supports professional barrier spray over DIY methods for meaningful, lasting mosquito reduction. Here's an honest breakdown of each approach. Part of our Ultimate Mosquito Control Guide.
Citronella Candles and Torches
Effectiveness: Low. Citronella products create a localized scent barrier that can marginally reduce mosquitoes near the immediate source — within about 1 metre of the flame. They have no residual effect and provide zero protection when the candle isn't lit. Research consistently shows citronella candles reduce mosquito landings by only 11–42% in the immediate vicinity — and that protection ends the moment the flame does, whereas a barrier treatment leaves a residual on the vegetation for weeks.
Best use: As a supplement on a patio table while sitting directly beside it. Not a yard-wide solution.
DEET and Other Personal Repellents
Effectiveness: High for personal protection; zero for yard control. DEET, picaridin, and lemon eucalyptus oil repellents applied to skin and clothing are genuinely effective at preventing individual bites. The issue: they protect people, not yards. You still have a mosquito-infested backyard — you just won't get bitten while wearing repellent. This doesn't let your children play freely, guests to enjoy the patio, or your dog to move around without bites.
Best use: As a personal protection supplement when going into heavily infested areas (trails, near wetlands).
Consumer Backyard Foggers and Yard Sprays
Effectiveness: Moderate short-term. Consumer foggers and hose-end sprays can provide 1–7 days of mosquito reduction when properly applied. The limitations are significant:
- Much lower active ingredient concentrations than professional-grade products
- Require the homeowner to apply thoroughly and consistently
- No guarantee of proper coverage (missed resting sites reduce effectiveness significantly)
- Faster breakdown — typically effective for only a few days to a week
- Repeated DIY application adds up in cost and time over a season
The Two DIY Tools Actually Worth Buying
As an Amazon Associate, BuzzSkito earns from qualifying purchases. BuzzSkito only points to products we would genuinely use or recommend, at no extra cost to you.
BTi mosquito dunks. Drop one into any standing water you cannot drain — rain barrels, pond edges, French drains, plant saucers — and the naturally-occurring bacterium kills mosquito larvae for about 30 days. Harmless to pets, birds, fish, and beneficial insects. Dunks stop mosquitoes from breeding on your property, but they do nothing about the adults already flying in from elsewhere.
Thermacell spatial repellent. A rechargeable unit like the E90 builds a roughly 6-metre repellent zone around a patio table while it runs — genuinely effective for a seated evening, useless for whole-yard protection or kids moving around the lawn. We break down the current lineup in our Thermacell E90 review for Canada.
Professional Barrier Spray
Effectiveness: High and sustained. Professional-grade residual insecticides applied by trained technicians provide the most comprehensive, longest-lasting mosquito reduction of any residential option. Key advantages:
- Higher active ingredient concentrations — more effective knockdown and longer residual
- Technician expertise — thorough coverage of all resting sites, including areas a homeowner typically misses
- Up to 30 days residual protection per visit
- Guaranteed results — BuzzSkito retreats at no cost if mosquitoes return within the protection window
The Bottom Line
For homeowners who want to actually use their backyard during GTA mosquito season, professional barrier spray is the only approach that reliably delivers a meaningful reduction in mosquito populations across the entire property. DIY methods are useful supplements — not substitutes.
