Pyrethrum Chrysanthemum Cinerariifolium flower Pyrethrum is a perennial herb that grows up to a height of anything between 30 cm and 75 cm 12 inches to 30 inches having lean stems that are covered with hair and grows deep green leaves that are profoundly slit open and separated into seven different sections. The pyrethrum herb produces a single, white flower that has resemblance to daisy in appearance between early summer and early autumn. Pyrethrum is native to Yugoslavia and Albania and belongs to the gorgeous daisy family and is extensively cultivated for its attractive flowers that produce one of the finest natural pesticides available. Pyrethrum is also widely grown in gardens mostly as a decorative plant and it creates a luxuriant knoll with lacey, green undergrowth.
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Tanacetum cinerariifolium Sch. Tanacetum cinerariifolium is a species of flowering plant in the aster family, Asteraceae. It is called the Dalmatian chrysanthemum, denoting its origin in that region of the Balkans Dalmatia. It looks more like the common daisy than other pyrethrums do.
Its flowers, typically white with yellow centers, grow from numerous fairly rigid stems. Plants have blue-green leaves and grow to 45 to cm 18 to 39 in in height. The plant is economically important as a natural source of an insecticide called "pyrethrum.
This is applied as a suspension in water or oil, or as a powder. Pyrethrins attack the nervous systems of all insects, and inhibit female mosquitoes from biting. When present in amounts less than those fatal to insects, they still appear to have an insect repellent effect. They are harmful to fish, but are far less toxic to mammals and birds than many synthetic insecticides and are not persistent, being biodegradable and also decompose easily on exposure to light.
They are considered to be amongst the safest insecticides for use around food. Production in Tanzania and Ecuador is also significant. These plants can cause severe allergic reactions in some people. Prolonged contact with the dried flowers can cause allergic dermatitis, allergic rhinitis, and asthma. Plants of the World Online.
Royal Botanical Gardens Kew. Retrieved 18 January
Chrysanthemum cinerariifolium — Pyrethrum C. It looks more like the common daisy than other pyrethrums. Its flowers, typically white with a yellow center, grow from numerous fairly rigid stems. Plants have blue-green leaves and grow to between 45 to 60 cm in height.
Piretro (Pyrethrum tanacetum o Chrysanthemum cinerariifolium)
Description[ edit ] Some members of the genus Chrysanthemum, such as the following two, are placed in the genus Tanacetum instead by some botanists. Both genera are members of the daisy or aster family, Asteraceae. They are all perennial plants with a daisy-like appearance and white petals. Tanacetum cinerariifolium Tanacetum cinerariifolium is called the Dalmatian chrysanthemum, denoting its origin in that region of the Balkans Dalmatia. It looks more like the common daisy than other pyrethrums do. Its flowers, typically white with yellow centers, grow from numerous fairly rigid stems.
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Pyrethrum seed Chrysanthemum
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