Summit's Mosquito and Gnat Barrier spray packaged in a convenient pre-calibrated hose-end sprayer makes it possible to enjoy your backyard without the annoyance of insect pests. Mosquito & Gnat Barrier contains permethrin, a residual insecticide that provides up to four weeks of repellency for a wide variety of insect pests including mosquitoes, ants, fleas, ticks, and more. Spraying your backyard can help to reduce suitable mosquito resting area (usually vertical vegetation), and therefore reduce your chances of being bitten. Spraying down wooded areas that you dog frequents can aid in reducing the risk of tick-borne illness for your pets and family.