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Pyrethrin
The pyrethrins are a class of organic compounds normally derived from ''Chrysanthemum cinerariifolium'' that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin is syntethically made by industrial methods, but it also naturally occurs in the Chrysanthemum flowers, and thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants.〔Mader, Eric, and Nancy Lee Adamson. "Organic-Approved Pesticides."Organic-Approved Pesticides (n.d.): n. pag. The Xerxes Society. The Xerces Society for Invertebrate Conservation, Oct. 2012. Web. 10 Mar. 2015. 〕 Their insecticidal and insect repellent properties have been known and utilized for thousands of years.
Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticide of choice, since these other compounds have been shown to have significant and persistent toxic effects to humans. Because they are biodegradable compounds, pyrethrins are now widely regarded as being preferable to pyrethroids, which is the name of a group of synthetic analogues of pyrethrin that accumulate in the environment. Pyrethrins are considered to be low toxicity pesticides from a human health standpoint.
==Physical and Chemical Properties==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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