Pyrethrins is a light yellow oilly liquid extracted from the flower of the plant Pyrethrum cinerariaefolium Trev.the Pyrethrins are a compound of active ingredients with good effect of killing insects. the Pyrethrins include PyrethrinⅠ, pyrethrins II,CinerinⅠ, Cinerin II,JasomlinⅠ, Jasomolin II.

The Pyrethrins is a Broad spectrum pesticide material, it belongs to classic neurotoxic and with the effect of stomach toxicity or fumigation.but it has not systemic action. the killing pharmacology is paralysising nerves of insect to death.  the normal insect will recover in 24 hours after poisoning; housefly be paralysised in 10 minutes with 60Z%-70% death rate. it is poisonous to Arthropods, fish, amphibians and reptiles; but its toxicity is not remarkable to Avian and mammalian animals.