Brooke Martin
Citronella candles are popular mosquito-repelling products, but their effectiveness has been questioned. While citronella oil, derived from the Cymbopogon plant, is believed to be a natural mosquito repellent due to its citrus scent, studies suggest it may not be as effective as claimed. Some experiments indicate that citronella candles might even attract mosquitoes due to the carbon dioxide produced during burning. As a result, consumers are encouraged to explore alternative mosquito repellent methods, such as fans, bug sprays, and plants like lavender and rosemary.
| Characteristics | Values |
|---|---|
| Effectiveness in repelling mosquitoes | Citronella candles are not very effective in repelling mosquitoes. |
| Effectiveness in repelling moths | No indication that citronella candles repel moths. |
| Alternative uses | Citronella candles are great for setting a mood. |
| Alternative mosquito repellents | EPA-approved repellents like DEET and Picaridin, oil of lemon eucalyptus sprays, and the Thermacell E65 Rechargeable Mosquito Repeller. |
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What You'll Learn
Citronella candles are ineffective at repelling mosquitoes
Citronella candles are popular for their pleasant scent and supposed mosquito-repelling properties. However, evidence suggests that they are ineffective at repelling mosquitoes and may not be worth the money.
A study published in Science tested 11 types of repellents on Aedes aegypti mosquitoes, which are known to transmit diseases such as Zika, yellow fever, and dengue. The study found that, at a distance of 1 meter, DEET and oil of lemon eucalyptus sprays reduced mosquito attraction by 60%, while a citronella candle was ineffective.
While citronella candles may provide some protection in the immediate area surrounding the candle, they do not prevent mosquitoes from entering your yard or multiplying. Mosquitoes are attracted to standing water, so eliminating potential breeding grounds, such as rainwater collected in yard debris or pet dishes, is a more effective way to control mosquito populations.
To protect yourself from mosquito bites, it is recommended to use EPA-approved repellents like DEET and picaridin, which offer a more substantial invisible shield than the smoke produced by citronella candles. For outdoor use, fans and mosquito-repelling plants, such as lavender, mint, and lemongrass, can also help keep mosquitoes at bay.
While citronella candles may create a pleasant ambiance, they are not a reliable method for repelling mosquitoes. For effective mosquito control, a targeted, multipronged approach that includes eliminating breeding grounds and using proven repellents is recommended.
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DEET and picaridin are effective mosquito repellents
Citronella candles are popular for their pleasant scent and supposed mosquito-repelling properties. However, their effectiveness in repelling mosquitoes is questionable. While they may provide some protection in the immediate vicinity of the candle, they are not a reliable method for keeping mosquitoes at bay over a larger area.
Now, let's discuss two of the most widely recognized and effective mosquito repellents: DEET and picaridin. Both DEET and picaridin are proven to be highly effective at repelling mosquitoes, ticks, and flies. DEET, or N,N-diethyl-m-toluamide, is a synthetic chemical that has been used for insect repellent since its development by the U.S. Army in 1946. It offers long-lasting protection, with varying concentrations providing up to six or more hours of defense against mosquitoes. DEET is considered the gold standard in insect repellents due to its effectiveness and extensive history of study and use. When used as directed, it does not pose any significant health concerns, according to assessments by the EPA. However, some people may prefer alternatives due to its strong smell and oily feel.
Picaridin, on the other hand, is a newer alternative to DEET. It is a synthetic version of a repellent found in pepper plants. Picaridin offers comparable effectiveness to DEET in repelling mosquitoes and is even considered slightly more effective by some sources. One of its advantages over DEET is that it is odorless, non-greasy, and does not damage plastics or synthetic materials. However, its relative newness may raise questions about potential long-term health risks that have not yet been identified. Repellents containing 20% picaridin are considered to provide maximum protection.
Both DEET and picaridin are widely recognized as top-performing mosquito repellents, with their own unique advantages and considerations. While DEET has a longer history of use and extensive studies supporting its safety and effectiveness, picaridin offers a fresh alternative with improved sensory and material-friendly qualities. The choice between the two ultimately depends on individual preferences and specific needs.
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Mosquitoes are attracted to CO2
Citronella candles are a popular choice for those looking to create a pleasant atmosphere, but they are not the best method for repelling moths and mosquitoes. While they may offer some protection against mosquitoes, this is limited to the immediate area surrounding the candle. Therefore, it is recommended that citronella candles are used as just one layer of protection against mosquitoes, alongside other methods.
Mosquitoes are attracted to a combination of factors, one of which is carbon dioxide (CO2). They detect the CO2 we exhale through special receptors called maxillary palp receptors. However, it is not solely CO2 that mosquitoes use to locate their human hosts. Research has shown that when CO2 detection was taken away, mosquitoes were still able to find people, albeit with a diminished attraction to live hosts. This suggests that other factors also play a significant role in mosquito attraction.
One such factor is body odor. Mosquitoes are attracted to the unique mixture of chemicals produced by our skin bacteria and sweat glands. Additionally, they can detect and are attracted to lactic acid, which is emitted through the skin when we are active or after consuming certain foods. Interestingly, drinking beer can also increase your attractiveness to mosquitoes, according to a study that found "beer consumption" consistently drew more mosquitoes.
Another factor that influences mosquito attraction is body heat. Mosquitoes can sense the heat we radiate, particularly from our head and torso. They are also able to detect movement and are more attracted to people who are in motion. This is because movement indicates the presence of heat, which mosquitoes use to locate potential hosts. Additionally, the color of clothing can play a role, with mosquitoes showing a preference for darker colors.
While it is challenging to completely exclude mosquitoes from your surroundings, a targeted, multipronged approach can significantly reduce their numbers. This includes eliminating sources of standing water, where mosquitoes lay their eggs, and using mosquito repellents on exposed skin. Wearing long sleeves and light-colored clothing can also help reduce mosquito bites by covering exposed skin and making you less attractive to mosquitoes, respectively.
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Ultrasonic devices don't work
While citronella candles are popular, they are not very effective in keeping mosquitoes away. They are moderately effective at repelling mosquitoes but only in the immediate area surrounding the candle. The closer you are to the candle, the less likely you are to be bitten by a mosquito.
Now, let's discuss why ultrasonic devices don't work. Ultrasonic pest repellers are battery-powered or plug-in devices that emit high-frequency sounds to repel pests. The sound is supposed to cause a physiological response in pests known as audiogenic seizure response, characterized by non-directional running, convulsions, and possibly death from cerebral hemorrhage. The idea is that confused rodents will flee when the sound disrupts their ability to gather food, breed, build nests, or communicate. However, there is no credible scientific evidence that ultrasonic pest repellers work.
In 2003, the Federal Trade Commission demanded that Global Instruments, one of the chief marketers of ultrasonic repellents, discontinue their advertising campaigns due to a lack of credible scientific evidence supporting their claims. A report from the University of Lincoln, Nebraska, examined six studies of ultrasonic repellers and found that all tested products were insufficient at repelling rodents. Another extensive test performed by Kansas State University in 2002 found that while the devices were effective at repelling some insects like crickets, they had little effect on cockroaches, and ants and spiders were unaffected.
Even when models are proven successful in tests, they may not perform adequately in real-world situations due to signal strength being blocked by walls and furniture. Safety concerns have also been raised, as the sound can interfere with telephone conversations, burglar alarm systems, and cause muting in hearing aids. Additionally, the noise may cause distress to pet rodents such as guinea pigs and hamsters. While some users have reported success with ultrasonic pest repellers, there are more reliable and inexpensive forms of pest control available, such as chemical pesticides, traps, or even cats.
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Natural mosquito-repelling plants
Citronella candles are popular for repelling mosquitoes, but they are not very effective. They only work in the immediate area surrounding the candle, and do nothing to prevent mosquitoes from multiplying.
There are, however, several natural mosquito-repelling plants that can help keep mosquitoes at bay. These plants work by emitting fragrances that are soothing to humans but repulsive to mosquitoes. Here are some examples of plants that can help deter mosquitoes:
- Lavender is a fragrant plant that is often used in gardens to add colour and scent. It is also effective at repelling mosquitoes and can be placed near seating areas or doorways to deter mosquitoes from entering your home.
- Mint is an excellent non-toxic option for keeping mosquitoes away. The sweet smell of mint is pleasing to humans but not to mosquitoes. Mint can be grown in pots on your patio or indoors to naturally repel mosquitoes.
- Rosemary is a woody-scented herb that is effective at repelling mosquitoes, as well as cabbage moths and carrot flies. It can be grown in hot and dry climates and thrives in containers, making it ideal for decorative borders or hedgerows.
- Lemongrass contains a high level of citral, an oil commonly used in mosquito repellents. It is a low-maintenance plant that does best in large planters or directly in the ground in warmer climates.
- Marigolds are hardy annuals that grow easily in full sun and moist soil. They have a strong fragrance and contain pyrethrum, a compound used in many repellents. Marigolds can be planted as edging, borders, or intermingled with other garden plants to help repel mosquitoes.
- Catmint is a member of the mint family that is easy to care for and grows abundantly. In a study at Iowa State University, catmint was found to be ten times more effective at repelling mosquitoes than DEET, the chemical used in most insect repellents.
- Alliums are hardy bulbs that produce dramatic balls of purple, blue, yellow, or pink flowers. They bloom in spring, just in time to help repel mosquitoes. Alliums can be planted from seed or bulb in spring or fall and need full sun to light shade and well-drained soil.
- Carnivorous plants like the pitcher plant, Drosera, and Venus flytraps can also be grown to attract and trap mosquitoes.
While these plants can help deter mosquitoes, it is important to note that they may not be completely effective on their own. A multipronged approach that includes eliminating breeding grounds and using other repellents may be necessary to significantly reduce mosquito numbers.
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Frequently asked questions
No, they do not. While citronella oil is regarded as a "natural" mosquito repellent, there is no indication that citronella candles are effective in repelling mosquitoes.
Yes, oil of lemon eucalyptus sprays are effective in repelling mosquitoes. These sprays are extracted from the gum eucalyptus tree and are recommended by the Center for Disease Control.
Yes, you can use fans to keep mosquitoes away as they are weak fliers. You can also add mosquito-repelling plants to your space, such as lavender, mint, rosemary, and lemongrass.
Some mosquito repellent products that are effective include DEET, Picaridin, and the Thermacell E65 Rechargeable Mosquito Repeller.
While there is no definitive answer, it is unlikely that citronella candles repel moths as they do not repel mosquitoes.
