This product acts as a scarecrow for wasps. It is perceived as a hornet's nest, so wasps see this as a predator and avoid the area. Keeps wasps away but does not kill them. Wasps are beneficial to our environment and help regulate pests such as aphids, caterpillars and mosquitoes. Other 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. If you have large existing nests, have them removed, then continue to use DeWitt Natural Wasp Away every year.