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Why CO2 is the master mosquito cue
Every mosquito trap is trying to win the same race your own body enters every time you step outside: the competition to be the most obvious host. A host-seeking female locks onto a plume of carbon dioxide from up to 10 metres away, then closes the gap using body heat and the smell of your skin. We wrote a whole breakdown of that hunt in what attracts mosquitoes to you — but the short version is that CO2 is the long-range beacon. That is exactly why a CO2 mosquito trap can out-compete you: it pumps out a bigger, more convincing plume than a single person, and it never swats.
The device follows a simple loop. Release CO2 and a skin-scent lure, let the plume drift downwind, and when a female flies upwind to investigate, a suction fan pulls her into a catch bag where she dehydrates within hours. The differences between traps come down to one question: how do you generate the CO2? Answer that, and you have basically chosen your trap.
The three ways a trap makes CO2 (and why it matters)
1. Sugar & yeast fermentation
The cheapest, greenest, and weakest method. Mix sugar, water, and yeast in a bottle and the fermentation exhales a trickle of CO2. It is the DIY-mosquito-trap staple all over YouTube. The problem: the output is tiny and inconsistent, it fades within days, and in the July heat it goes sour fast. It is a fun science-fair project, not a serious control tool. Biogents sells a managed sugar-yeast option as part of its CO2 booster line, which is more reliable than a pop-bottle rig but still modest.
2. Propane combustion
This is the Mosquito Magnet approach: burn propane through a catalytic converter and you get a strong, steady CO2 plume plus warmth and moisture — a very realistic fake human. The upside is reach: a good propane unit works across roughly an acre. The downside is that combustion is the entire mechanism, so the 20 lb tank is mandatory, and you will swap it about every three weeks all season, plus feed it attractant cartridges. If you want that reach, our propane mosquito trap guide covers the models and the tank math in detail.
3. Electric fan + chemical lure (the Biogents way)
Here is the ‘no tank required’ answer people are searching for. Biogents traps run on a wall plug and the BG-Lure — an artificial-skin attractant that reproduces the fatty acids, lactic acid, and ammonia your skin gives off. The fan and lure alone catch mosquitoes with zero CO2. You can optionally clip on the BG-Booster to add a compressed-CO2 cylinder or a managed sugar-yeast generator for heavy-pressure yards, but it is a boost, not a requirement. No combustion, no fuel runs, no tank storage — just a plug and a lure you replace every few months.
Why Biogents is the trap researchers actually use
This is the part that separates Biogents from the wall of generic ‘electric CO2 mosquito killer’ boxes on Amazon.ca. The company’s BG-Sentinel trap — the professional model behind the consumer BG-Home and BG-Mosquitaire — is a standard tool in academic mosquito surveillance. When public-health researchers need to count how many Aedes or Culex mosquitoes are in an area, the BG-Sentinel is one of the traps they set. The patented airflow and the BG-Lure were refined against real capture data, not a marketing brief.
For a homeowner that pedigree matters in a concrete way: the consumer traps inherit the same airflow geometry and the same lure chemistry that earned the research trap its reputation. As GTA operators, we would rather point a customer to a design with peer-reviewed capture data behind it than to a no-name unit whose only evidence is a five-star review and a stock photo. No backyard trap is a silver bullet — but if you are going to buy one, buy the one with the science.
The BG-GAT: the quiet genius of the lineup
The single most interesting trap Biogents makes needs no power and no CO2 at all. The BG-GAT (Gravid Aedes Trap) hunts a very specific, very valuable target: the gravid female — a mosquito that has already bitten someone, is now carrying eggs, and is prowling for a place to lay them. You fill the GAT with water and a grass-infusion lure so it smells like the perfect breeding puddle. She enters through a funnel to lay, hits a sticky or insecticidal surface, and never comes back out.
Why does that matter more than catching random flyers? Because you are removing the exact insects about to seed the next generation. Kill one gravid female and you cancel the 100–300 eggs she was about to lay. GATs are deployed in clusters — three or more around a property — and they are ideal for the situations where a plug-in trap is a pain: cottages, off-grid yards, dense garden beds. They are also aimed squarely at Aedes — the aggressive, daytime-biting container mosquitoes that shrug off dusk-focused tactics. For a cottage owner who wants set-and-forget control with no electricity, a GAT cluster is genuinely clever.
Electric vs propane: the cost-per-season math
The convenience gap between electric and propane traps shows up hardest in the running cost across an Ontario season (roughly May through September — see our Mosquito Magnet Canada breakdown for the propane side in full).
- Propane trap: about 6 tank refills across the season at $25–$40 each, plus attractant cartridges every ~3 weeks. Budget roughly $350–$550/season in consumables on top of the device — and that is before the inconvenience of hauling tanks.
- Electric Biogents (lure only): pennies of electricity per day plus a BG-Lure replacement every few months. Realistically $60–$120/season in consumables. No tanks, ever.
- Electric Biogents + CO2 booster: add cylinder refills if you run compressed CO2; still no propane, and you only run the booster when pressure is high.
- BG-GAT (passive): only water and refill lures — the cheapest of all to keep running.
For a standard 5,000–15,000 sq ft (465–1,400 m²) suburban lot in Mississauga or the wider GTA, the electric-plus-lure setup almost always makes more sense: lower running cost, no combustion, no tank storage in the garage. Propane only pulls ahead when raw coverage on a 1+ acre lot is the priority. If you are still weighing the whole category — UV, propane, electric, and everything else — our best mosquito trap in Canada guide ranks them head-to-head.
Where to place a CO2 trap in an Ontario yard
- Away from where you sit — 3–10 m (10–30 ft) from the patio so the trap intercepts mosquitoes before they reach you, not in the middle of your gathering.
- In shade, near vegetation — mosquitoes rest in cool, humid, shaded spots during the day; place the trap on the edge of that resting habitat.
- Out of strong wind — a stiff breeze shreds the CO2 plume. Tuck the trap into a sheltered pocket of the yard.
- Run it continuously — traps are a population tool. Switching them off for a week lets the numbers rebound. Set it and leave it from May to September.
- Deploy GATs in clusters — one GAT is a data point; three or more around the yard perimeter is a control strategy.
Traps vs professional barrier spray: use both
A CO2 trap and a professional barrier spray are not rivals — they cover different timelines. The trap slowly draws the biting-female population down inside its zone and keeps working all season. The barrier spray coats the shaded leaf surfaces where mosquitoes rest and knocks the yard population down within hours, holding about 21–30 days per treatment. Only one of them also suppresses ticks, and it is the spray — no CO2 trap catches ticks, because ticks do not fly to a plume.
The strongest real-world setup we see in GTA backyards is a professional barrier spray for fast, whole-yard knockdown plus a Biogents trap or a GAT cluster to keep pulling the population down between treatments. If ticks are also on your radar — and in Mississauga and Halton they should be — a trap does nothing for them; that is a job for a permethrin perimeter or a dedicated tick program.
Bottom line for Canadian buyers in 2026
If you want a CO2 mosquito trap and you have a normal suburban yard, buy an electric Biogents unit and skip the tank entirely — the running cost is a fraction of propane and the capture design has real research behind it. If you have a cottage or a 1+ acre rural lot, a propane trap’s reach or a cluster of passive BG-GATs is the better fit. And whatever trap you run, pair it with a professional barrier spray when you need the yard usable now, and a separate tick strategy if blacklegged ticks are in your area.