DeWitt natural wasp away works like a scarecrow for wasps. The DeWitt natural wasp away is perceived as a hornet's nest so wasps see this as a predator and avoid the area. DeWitt natural wasp away keeps wasps away but does not kill them. Wasps are beneficial to our environment and help regulate other pests such as aphids, caterpillars and mosquitoes. Traps and bug zappers kill wasps which may cause more wasps to target the area. When a wasp dies, it releases a pheromone which attracts more wasps.