pyrethrum
Pyrethrum is an insecticidal extract obtained from the dried flower heads of certain chrysanthemum species, principally Chrysanthemum cinerariifolium and Chrysanthemum coccineum (also classified as Tanacetum cinerariifolium). The flowers are harvested, dried, and processed to produce powders or concentrates that contain the active compounds known as pyrethrins.
The six closely related esters that make up pyrethrins are pyrethrin I and II, cinerin I and
Pyrethrum production involves cultivation of suitable cultivars, hand-harvesting of flower heads, drying, and extraction of pyrethrins
Safety and environmental notes: Pyrethrins degrade rapidly in sunlight and have low persistence in the environment,