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Friday, May 02, 2008

Variouls Essential Oil Scented Candles Tested As Insect Repellents

We've all smelled Citronella candles at some time or another, using them as mosquito repellents in the heat of summer. A pair of studies performed at The Hebrew University, Hadassah-Medical School in Jerusalem compared the efficacy of various aromatherapy candles with different essential oil or oil components as their scent. Geraniol was the most potent of the mosquito repellents; this essential oil component is most abundant in Geranium essential oil.

Study: Ability of essential oil candles to repel biting insects in high and low biting pressure environments.

Müller GC, Junnila A, Kravchenko VD, Revay EE, Butler J, Orlova OB, Weiss RW, Schlein Y.
Department of Parasitology, Kuvin Centre for the Study of Infectious and Tropical Diseases, The Hebrew University, Hadassah-Medical School, Jerusalem, Israel.

The first goal of this study was to compare the degree of personal protection against biting insects provided by geraniol, linalool, and citronella candle (5%) vapors outdoors, where such products are commonly used. At a distance of 1.0 m, citronella candles reduced the number of female mosquitoes caught in Centers for Disease Control and Prevention traps by 35.4% and sand flies by 15.4%, linalool candles reduced female mosquitoes by 64.9% and sand flies by 48.5%, while geraniol candles reduced female mosquitoes by 81.5% and sand flies by 69.8%. By increasing the distance to 2 m and 3 m, the repellency dropped significantly. The second goal was to compare the degree of personal protection provided by the best performing candle, geraniol, under conditions of high and low biting pressure. The introduction of geraniol candles to protect volunteers in a high biting pressure environment reduced the mosquito pressure by an average of 56% and the sand fly pressure by 62% over a distance of 1.0 m. In the low biting pressure environment, geraniol reduced the mosquito pressure by an average of 62%. No sand flies were present at this site.

Study: Indoor protection against mosquito and sand fly bites: a comparison between citronella, linalool, and geraniol candles.

Müller GC, Junnila A, Kravchenko VD, Revay EE, Butlers J, Schlein Y.
Department of Parasitology, Kuvin Centre for the Study of Infectious and Tropical Diseases, The Hebrew University, Hadassah Medical School, Jerusalem, Israel.

The repellent effect of 3 essential oil-based candles was evaluated in a high biting pressure environment in Israel. In human landing assays, the repellency rate of 5% citronella candles against mosquitoes was 29.0%, of 5% linalool candles was 71.1%, and of 5% geraniol candles was 85.4%. The candles with geraniol were about twice as effective as those with linalool and were about 5 times as effective as citronella candles in protecting a person from being bitten indoors by mosquitoes. The repellency rate of 5% citronella candles towards sand flies was 24.7%, of 5% linalool candles was 55.2%, and of 5% geraniol candles was 79.7%. A geraniol candle was almost 5 times as effective as a citronella candle and about twice as effective as a linalool candle in protecting a person from being bitten indoors by sand flies.








*The FDA has not evaluated the statements on this website. The information presented here is for educational purposes of traditional uses and is not intended to diagnose, treat, cure, or prevent any diseases.


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