Editing Pyrethrin (section)

==History==
The pyrethrins occur in the seed cases of the [[perennial plant]] [[pyrethrum]] (''[[Chrysanthemum]] cinerariaefolium''), which has long been grown commercially to supply the [[insecticide]]. Pyrethrins have been used as an insecticide for thousands of years. It is believed that the Chinese crushed chrysanthemum plants and used the powder as an insecticide as early as 1000 BC. It was widely known that the [[Zhou dynasty]] in China widely used pyrethrin for its insecticide properties.<ref name="History 2015">"History." {{Dubious|date=March 2019}} Pyrethrum Nature's Insecticide. MGK, n.d. Web. 23 Apr. 2015.</ref> For centuries, crushed Chrysanthemum flowers have been used in Iran to produce [[Persian powder|Persian Powder]], an insecticide for household use. Pyrethrins were identified as the potent chemical in the Chrysanthemum plants responsible for the insecticidal properties in the crushed flowers around 1800 in Asia. In the [[Napoleonic Wars]], French soldiers used the flowers to keep away fleas and body lice.<ref name="History 2015"/> {{Dubious|date=March 2019}}