Southern Ag Pyrethrin Concentrate previously known as Southern Ag Natural Pyrethrin Concentrate uses a natural insecticide, pyrethrin, that is made from a relative of chrysanthemum. Pyrethrins have been used for decades as an insecticide. Use Southern Ag Pyrethrin Concentrate on ornamentals, vegetables, in your home, and even on pets to control a wide variety of insects. Can be use as a spray or dip.