pyrethrum

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py·re·thrum

(pī-rē'thrŭm),
The root of Anacyclus pyrethrum (family Compositae), a shrub native to Morocco; has been used as a sialogogue; its flowers are a source of pyrethrins.
[G. pyrethron, feverfew, fr. pyr, fire, from the hot-tasting root]

pyrethrum

an INSECTICIDE prepared from the dried flowers of the chrysanthemum plant, the active ingredient being called pyrethrin.
References in periodicals archive ?
The pyrethrum is then sprayed to the trees, after 10 minutes, the researchers will shake the trees and count the amount of antestia beetles that have been "knocked down" by the spray.
A PYRETHRUM, now known as Tanacetum coccineum, the painted daisy, is a perennial.
Pyrethrums (extract of chrysanthemum) can also be sprayed on animals' bedding and carpets.
SIX PYRETHRUMS MIXED FOR JUST PS2.99 A popular choice for borders where the variation in colours really stands out, pyrethrums are large, daisy-like flowers that appear in abundance from late May through to September.