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  • 2002-07-02 (xsd:date)
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  • Do Lemon Fresh Joy and Listerine Kill Mosquitoes? (en)
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  • The ongoing war between man and bug prompts in many people a continual search for an inexpensive and effective weapon against mosquitoes, preferably something natural (or at least something that isn't specifically a pesticide and therefore poses less danger of harming or killing humans and their pets). The perennial struggle often leaves warriors confused about the difference between substances that kill mosquitoes, substances that merely repel them, and substances that do neither. The good news in the mosquito wars is that one need only worry about the females of the species, because male mosquitoes don't bite. Male and female mosquitoes both feed on nectar for sustenance; the female, however, requires blood to lay her eggs. It matters not how many male mosquitoes she's been with; without the blood she draws from her victims she will not gain entry into the ranks of mosquito motherhood, so instinct drives her to take a piece out of someone. (That's the bad news, of course: mosquito bites signify that more batches of little skeeters are on the way.) Female mosquitoes are attracted to carbon dioxide (the more carbon dioxide a person emits, the more likely that person is to be singled out by a motherhood-driven mosquito) as well as moisture, warmth, and body odor. Mosquito repellents such as DEET work not by repelling mosquitoes in a literal sense, but by blocking the receptors on their antennae that allow them to home in on human beings. A few drops of Lemon Joy dishwashing soap in a plate or bowl of water is neither an effective mosquito repellent (although it might have limited effectiveness for that purpose if you slathered it all over your body) nor a concoction that will cause flocks of mosquitoes to fall out of the sky dead. As noted, mosquitoes are attracted to moisture, so putting out an open container of water mixed with soap can draw some of the critters into landing and coating themselves with a sticky film that prevents them from escaping, but that's about it. There's nothing special about Lemon Joy that attracts hordes of skeeters and sends them plummeting to the ground dead. Likewise, spraying Listerine around your home or outdoor areas isn't an all-purpose mosquito preventive. It may kill some mosquitoes on which it is directly sprayed, but it won't serve to keep knocking mosquitoes dead for hours and hours afterwards. Because it contains trace amounts of eucalyptol, mouthwash may also have limited effectiveness as a mosquito repellent, but it needs be kept in mind that actual eucalyptus-based mosquito repellents contain the compound in concentrations as high as 75 percent whereas the eucalyptol in mouthwash is usually below 1 percent, which means if it works at all, it isn't going to work very well or for very long. The latest entry in the cheap and easy litany of mosquito solutions is the suggestion that limes pressed with cloves forms an effective ALL NATURAL mosquito repellent. We haven't yet gauged the effectiveness of this approach. In general, you get what you pay for: DEET will typically repel mosquitoes more effectively and for much longer than solutions concocted from commercial household products intended for completely different purposes. (en)
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