Viper Insecticide is an all-around insecticide concentrate with Cypermethrin which is a concentrate that you mix with water in a handheld pump sprayer. Viper is a very popular insecticide concentrate, killing many pests. Viper insecticide is a popular choice to control a wide variety of insects and may be used inside or outside. It will control ants, bees, centipedes, cockroaches, crickets, firebrats, millipedes, silverfish, sowbugs, spiders, flies, mosquitoes, gnats, small flying moths, wasps, hornets, and yellow jackets.