Does Citronella Actually Work Against Mosquitoes?

Citronella for mosquitoes isn’t really a complete myth. 

It has a measurable repellent effect on mosquitoes, and it’s been studied enough to know what it actually does. 

The problem is the gap between what it does and what most people expect it to do when they light a candle on the patio and assume they’re covered for the evening.

Citronella is not the only one, either. In fact, it is perhaps the most popular example of a broader category of mosquito deterrents that have more reputation than results. 

Bug zappers, mosquito bracelets, ultrasonic repellers, and various “natural” outdoor sprays all share the same dynamic. They address the mosquito near you rather than the source producing mosquitoes in your yard.

That gap is where every frustrating summer night spent swatting mosquitoes despite a burning citronella candle comes from.

What Citronella Actually Does, and Where It Falls Short

Citronella is a naturally derived essential oil extracted from lemongrass plants. It works by masking the carbon dioxide and body odour cues that mosquitoes use to locate a host, essentially making you harder to find rather than making the environment hostile to mosquitoes. That’s an important distinction that most product packaging skips over.

Citronella oil was an approved active ingredient until it was phased out, which means there was a regulatory basis for the claim that it does something. 

It’s not a pesticide; it doesn’t kill mosquitoes, and it doesn’t reduce the population in your yard. 

It simply masks. 

That distinction matters a great deal for what happens next.

Photo credits to pexels.com

Studies have consistently shown that citronella candles provide limited, localised protection, an effective radius of roughly one metre under calm conditions, and considerably less if there’s any breeze at all. One study found that citronella candles reduced mosquito landing rates by around 35% compared to a plain candle. 

That sounds reasonable until you consider that a plain candle, producing carbon dioxide from combustion, already has a minor repellent effect on its own. The net citronella benefit is real, but modest, and it comes with a built-in expiry.

Duration is the other problem. Citronella’s masking effect dissipates quickly in open outdoor environments where the oil concentration disperses almost immediately into the surrounding air. The candle keeps burning. The protection keeps leaving. 

On skin as a spray or lotion, citronella performs better than it does as a candle, but citronella-based repellents provide shorter protection times than other registered insect-repellent formulas for mosquitoes, like DEET or icaridin, and need to be reapplied significantly more often.

Why Outdoor Spaces Are Where It Fails

A patio, a deck, a backyard, these are open environments where repellent concentration disperses almost the moment it’s produced. Even a light breeze is enough to push the effective concentration away from where you’re sitting within seconds. Multiple candles help, yes, but the cost-to-coverage ratio quickly becomes impractical. 

You’d need a very high density of burning citronella across a full yard to maintain a meaningful concentration. And even then, you’re not doing anything about the mosquito population itself.

That’s the core limitation. 

Citronella doesn’t reduce numbers, interrupt breeding cycles, or address the conditions producing mosquitoes in your yard. On an evening when you have mosquitoes all around you, citronella is managing your immediate vicinity while the surrounding population carries on entirely unchanged. 

What Actually Keeps Mosquitoes Away

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Effective outdoor mosquito control works at the population level, not the proximity level. The goal is reducing the number of mosquitoes producing, breeding, and resting in your yard, not masking yourself from the ones already in the air.

Two things make the biggest difference:

• Eliminating standing water is the highest-impact action a homeowner can take on their own. Any water that sits for more than a week becomes a breeding site. A low spot in the lawn, a blocked gutter, a bird bath, a tarp that pools after rain. These are all contributing to the local mosquito population more than most people realise. Removing them removes the source.
• Barrier treatment targeting resting vegetation addresses the adult population already active in the yard. Mosquitoes spend the majority of their time sheltering in dense plantings, fence lines, and shaded areas during the day. Treating those zones reduces what comes out every evening. Timing matters here too. Getting ahead of the population before pressure builds is what makes barrier treatment effective rather than reactive. 

Citronella Is Fine. It’s Just Not Enough.

Nobody’s saying to throw out the citronella candle. It’s a nice thing to have on the table, and it does something. It’s just not doing the thing you need it to do if mosquitoes are making your yard genuinely unusable from June through August.

Population-level control is what makes a summer night on the deck actually comfortable, consistently, and not just on the one calm evening when the candle happened to hold its concentration long enough to matter.

Book your pest control package and get the outdoor environment treated properly before peak season arrives. We proudly serve regions across Calgary, Edmonton, Red Deer, Regina, Saskatoon, and Winnipeg.