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Pyrethrum (Chrysanthemum [or Tanacetum] cinerariaefolium) is economically important as a natural source of insecticide. The flowers are pulverized, and the active components, called pyrethrins, which occur in the achenes, are extracted and sold in the form of an oleoresin. This is applied as a suspension in water or oil, or as a powder.
One of the four stereoisomers, (1R,3R)- or (+)-trans-chrysanthemic acid (pictured), is the acid part of the ester pyrethrin I, which occurs naturally in the seed cases of Chrysanthemum cinerariaefolium. Many synthetic pyrethroids, for example the allethrins, are esters of all four stereoisomers. [1]
Pyrethrum was a genus of several Old World plants now classified in either Chrysanthemum or Tanacetum which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus Pyrethrum .
Tanacetum cinerariifolium is a species of flowering plant in the aster family, Asteraceae, [1] and formerly part of the genus Pyrethrum, but now placed in the genus Chrysanthemum, or the genus Tanacetum by some biologists. It is called the Dalmatian chrysanthemum or Dalmatian pyrethrum, denoting its origin in that region of Europe (Dalmatia ...
A Sweet Year: Jewish Celebrations and Festive Recipes for Kids and Their Families by Joan Nathan (Knopf) and My Life in Recipes: Food, Family, and Memories by Joan Nathan (Knopf). After a seven ...
The Persian chrysanthemum C. coccineum also produces pyrethrins but at a much lower level. Both may be planted in low-altitude zones in dry soil, but the pyrethrin level is lower. [15] Pyrethrum extracted of the Persian chrysanthemum (painted daisy) was already imported to central Europe from Georgia in the middle of the
Persian powder is a green pesticide that has been used for centuries for the biological pest extermination of household insects, garden pests, and agricultural pests. [2] It may first have been exported from Persia to Ancient Rome. Pyrethrin and pyrethroids are used indoors, in gardens and the horticulture industry, and in agriculture.
Chrysanthemum procumbens (L.) Sessé & Moc. Tridax procumbens , commonly known as coatbuttons [ 2 ] or tridax daisy , is a species of flowering plant in the family Asteraceae . It is best known as a widespread weed and pest plant.