MOSQUITOES-WHAT WORKS AND WHAT DOESN'T

Which mosquito repellent is best for you? By Lauren Oster Published July 16, 2016.  

Picking up a few bug bites used to be one of summer's rites of passage. It's not so innocent these days: Shielding yourself from ticks and mosquitoes is just as important as wearing sunscreen. "People used to hate to wear [insect] repellent, or say, 'Oh, I don't care about getting bitten,'" said Walter S. Leal, PhD, a chemical ecologist and professor of entomology at the University of California, Davis. Now, many experts warn that mosquitoes carrying the Zika virus may reach certain parts of the United States. Plus, West Nile has been reported in all 48 continental states. What's more, it's not just mosquitoes we need to be guarding against; ticks are a concern, too. The Centers for Disease Control and Prevention estimates Lyme disease rates have been rising steadily for at least three decades, and ticks can also carry other potentially fatal diseases.  Before you rush to the drugstore to stock up on bug spray, here are a few things you need to know. Keep your eyes peeled for EPA registration "Of the 20,000 products out there to supposedly repel insects, many don't work at all," said Immo A. Hansen, PhD, a molecular vector physiology expert at New Mexico State University whose team recently published a study of repellent efficacy in the Journal of Insect Science . So when can you actually believe what the label says? Most skin-applied insect repellents must be registered by the Environmental Protection Agency before they reach the market; if you see an EPA registration number on a product label, you know that it's been tested for safety and effectiveness. Better yet, as of this year, some products now have a black-and-yellow repellency awareness graphic which clearly states how long they have been proven to repel mosquitoes and ticks; that symbol means the company has provided the EPA with scientific data to support their claims.  Don't be afraid of DEET "People have the notion that DEET is synthetic and therefore it's not a good thing," Leal said. "But it's so effective and so good that it's lasted for more than six decades. No other product has been tested for safety and effectiveness in repelling insects more than DEET, Leal says, and reports of health risks have largely been overblown. Plus, it's the only type of repellent that the CDC recommends for tick protection. It's safe to use on children 2 months and older. "If you're going to stay outside and you don't want to bother with reapplying many times, I think DEET is the best thing we have on the market," Leal said. For most purposes, formulations containing 20 percent DEET are effective, Leal said. There is one downside to DEET: it has a pesky plasticizing effect that can damage fabrics, surfaces, and materials. It won't harm cotton, wool, or nylon, but materials like rubber, plastic, leather, vinyl, spandex, and even auto paint are fair game, so be sure to wash your hands thoroughly after handling it.  According to Research Picaridin is also a good choice Picaridin, another synthetic repellent, is also effective at keeping mosquitoes at bay for extended periods of time. (It may also protect against ticks, but the CDC recommends sticking to DEET if you're going to be in a tick-heavy area.) In a recent Consumer Reports spray-off, a product with 20 percent picaridin repelled mosquitoes for 8 hours and was considered the best repellent overall. While it lacks DEET's distinguished history (it's too new for us to know of potential long-term health risks-it was just approved for sale in the U.S. in 2005, whereas DEET has been around since 1946), it won't damage your belongings the way DEET can. Stacy Rodriguez, Hansen's colleague at the Molecular Vector Physiology Laboratory at New Mexico State University, is investigating the efficacy of repellents containing picaridin this summer. Candles and bracelets don't work Rodriguez has studied devices like oil of lemon eucalyptus bracelets and ultrasonic devices, and found none of them to be effective against mosquitos. "At this point in my research, I would strongly suggest spray-on repellents," she said. You can also forget about citronella candles-research shows don't work any better than regular candles at keeping bugs at bay. If keeping bugs out of your backyard is your goal, then your best bet is to eliminate standing water, where mosquitoes thrive.  There is one natural option, but it's not necessarily safer Synthesized oil of lemon eucalyptus (OLE) extract ( not the essential oil) is also an effective mosquito repellent. While it's plant-based, it isn't necessarily safer than lab-based repellents (and it doesn't repel ticks). The FDA cautions that OLE should be avoided for children under the age of 3, as it can cause temporary injury to the eyes. Which repellent is right for you? Plug your criteria (insect, protection time, active ingredient of choice, and so on) into the EPA's search tool.