Citronella is the most widely recognized natural mosquito repellent in the world. Derived from lemongrass-family plants, it works primarily by masking the human scents (CO2, lactic acid) that attract mosquitoes. EPA-registered as a biopesticide with minimal risk classification.
๐งช
Classification
Plant Essential Oil (Cymbopogon)
Signal Word
Exempt (25b)
Mode of Action
Olfactory masking: covers human attractant scents; mild contact repellent
How essential oil works โ illustrated mechanism of action
Mosquitoes (proven short-duration repellent), biting flies (moderate), gnats (moderate). Limited effectiveness against: ticks, fleas, chiggers. NOT effective against: ants, cockroaches, bed bugs, spiders, or any non-flying biting insect.
๐ท๏ธ Products & Brand Names
Citronella candles (OFF!, Cutter, Murphy's), citronella torch oil, Repel Plant-Based Lemon Eucalyptus (related but different โ oil of lemon eucalyptus is more effective than citronella), citronella wristbands (minimal effectiveness), citronella plants (Pelargonium citrosum โ very mild effect). Bug Soother spray.
โ ๏ธ Safety & Precautions
Very safe. FDA GRAS (Generally Recognized as Safe) status. No toxicity concerns at normal use levels. Can cause mild skin irritation in sensitive individuals โ especially from candle smoke. Safe around children and pets.
โ ๏ธ Honest effectiveness caveat: Citronella candles reduce mosquito landing rates by about 40-50% in studies โ helpful but far from complete protection. Standing directly in the smoke plume is most effective, but the protection zone is small (roughly 3-foot radius). Not comparable to DEET or picaridin for personal protection.
Example
0.5 oz
per gallon
โ๏ธ Mixing Calculator
Enter your sprayer size and target rate โ get the exact amount to pour. Backpack, hand sprayer, hose-end, or skid unit.
The real data: A 2017 Journal of Insect Science review found citronella products provide about 50% less protection than DEET-based repellents. They work โ just not as well or as long.
Best use case: Citronella candles and torches for outdoor dining/entertaining where you want SOME mosquito reduction without applying chemicals to skin. Place multiple candles around the seating area, not just one. Combine with fans โ moving air disrupts mosquito flight.
Oil of Lemon Eucalyptus (OLE): Often confused with citronella, OLE (p-menthane-3,8-diol or PMD) is actually CDC-recommended as comparable to low-concentration DEET. If you want a plant-based repellent that truly works, OLE is the better choice over citronella.
Citronella plants: Simply having a citronella plant on your patio does almost nothing โ the plant must be crushed to release its oils. The "mosquito plant" sold at garden centers (Pelargonium citrosum) contains very little citronella and has been shown in studies to be ineffective as a passive repellent.
๐ Pests This Treats โ Learn More
Click any pest to view its full identification guide, biology, and treatment options.
๐ก Repellent only. Minimal environmental impact. Effectiveness is limited and short-lived.
โฑ๏ธ Residual & Re-entry Timeline
๐น
Apply
Follow label mixing and application rates
๐ธ
Re-entry: Immediate
Keep people and pets out of treated area
๐ข
Effective period: 1โ2 hours
Active residual โ killing or repelling target pests
๐
Reapply
Re-treat when pest activity returns or residual expires
โ Frequently Asked Questions
Q: Is citronella safe for pets?
Follow the product label. Keep pets out of treated areas until completely dried (2โ4 hours for sprays). Once dry, treated surfaces pose minimal risk to dogs and cats.
Q: Can I use citronella indoors?
Check the specific product label โ formulations vary. Baits and dusts often have indoor labeling; concentrates and granulars are typically outdoor.
Q: How long does citronella last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15โ20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.
๐ Safety Data Sheet (SDS)
๐
Citronella for Pest Control โ Safety Data Sheet
View the official SDS document for this product directly on the CDMS label database.
๐ก Did you know? Despite being the world's most popular natural repellent ingredient, citronella's actual effectiveness is modest. The reason it dominates the market is that it smells pleasant, is extremely safe, and has strong consumer recognition โ not because it outperforms other options.
๐ฎ
Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional. Last reviewed: April 2026.