Pyrethroids are synthetic insecticides based on natural pyrethrum (pyrethrins), such as permethrin. Pyrethroids such as permethrin are synthetic insecticides based on natural pyrethrum. Another variety of "Chrysanthemum" used for the production of pyrethrins is the pyrethrum chrysanthemum. Exposure to pyrethrum, the crude form of pyrethrin, causes harmful health effects for mammals. Hagemann used crushed chrysanthemum flowers to produce a pyrethrum extract powder. The oil has insecticidal properties similar to pyrethrum. Pyrethrum also has an allergenic effect that commercial pyrethroids don't have. Or they can be natural compounds like pyrethrum, neem oil etc. The use of pyrethrum in insecticide preparations dates to about 400 BCE. Nevertheless, pyrethrum should be handled with the same caution as synthetic insecticides. It usually is identified in the literature with its synonyms, "Chrysanthemum parthenium" and "Pyrethrum parthenium". Crops grown in the country include coffee, tea, pyrethrum, bananas, beans, sorghum and potatoes. In the USA, the use of pyrethrum in home bug sprays (ie. Pellitory (Anacyclus pyrethrum) was traditionally used to relieve toothache. People using pyrethrum should wear safety equipment.