Mosi-Guard Natural Insect Repellent is a DEET-free insect repellent spray said to be one of the widely used natural insect repellents. Mosi-guard® Lemon Eucalyptus is an effective mosquito repellent, midge repellent and general insect repellent that helps keep biting insects and ticks at bay. Made with Oil of Lemon Eucalyptus sourced directly from the Eucalyptus Citriodora tree, it’s a DEET-free alternative to synthetic insect repellents and scientifically proven to be as effective.