Thermacell Tick Control Tubes are the no-spray, easy way to kill deer ticks and prevent them from spreading Lyme disease and Powassan virus to your pets and family members. Yard set-up takes only a few minutes twice a year. Product Features Kills backyard ticks with Lyme disease Doesn't harm kids, pets, or environment Easy to use: apply in minutes 2x a year. Watch video. Works with nature to reduce the tick population No spray; environmentally friendly Developed at Harvard University School of Public Health Works best in New England, the Mid-Atlantic, and the Northern Woods where instances of Lyme disease and Deer tick population is high The best time to apply is in late-April and late-July before young ticks begin feeding