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pyrethrum    
n. 除虫菊

除虫菊

pyrethrum
n 1: made of dried flower heads of pyrethrum plants
2: white-flowered pyrethrum of Balkan area whose pinnate leaves
are white and silky-hairy below; source of an insecticide;
sometimes placed in genus Chrysanthemum [synonym: {pyrethrum},
{Dalmatian pyrethrum}, {Dalmatia pyrethrum}, {Tanacetum
cinerariifolium}, {Chrysanthemum cinerariifolium}]
3: spring-flowering garden perennial of Asiatic origin having
finely divided aromatic leaves and white to pink-purple
flowers; source of an insecticide; sometimes placed in genus
Chrysanthemum [synonym: {painted daisy}, {pyrethrum}, {Tanacetum
coccineum}, {Chrysanthemum coccineum}]
4: used in former classifications for plants later placed in
genus Chrysanthemum and now often included in genus Tanacetum
[synonym: {Pyrethrum}, {genus Pyrethrum}]


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  • Pyrethrum - Wikipedia
    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: Overview, Uses, Side Effects, Precautions . . . - WebMD
    Learn more about Pyrethrum uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain Pyrethrum
  • Pyrethrum | Definition, Description, Insecticide, Species | Britannica
    pyrethrum, any of certain plant species of the aster family (Asteraceae) whose aromatic flower heads, when powdered, constitute the active ingredient in the insecticide called pyrethrin
  • Information About Pyrethrum Insecticide - Gardening Know How
    Pyrethrum is a chemical extract containing two active compounds, pyrethrin I and pyrethrin II In these forms, the chemical is directly derived from several different species of chrysanthemum as well as the painted daisy
  • Is Pyrethrum a Safe Organic Pesticide? - Todays Homeowner
    Pyrethrum is a naturally-derived insecticide from the Pyrethrum daisy (Chrysanthemum cinerariifolium,) sometimes called the Dalmatian chrysanthemum This perennial flower is loaded with chemicals called pyrethrins that are toxic to a wide variety of insects, from flies to moths
  • Pyrethrum: Benefits, Insecticidal Properties, Key Compounds, and Modern . . .
    Pyrethrum is widely utilized in organic farming and home gardening as a natural insecticide It is applied as a spray or dust to control a broad spectrum of pests, including aphids, beetles, and other insects harmful to crops
  • Pyrethrins and Pyrethroids | Public Health Statement | ATSDR
    Pyrethrum is a naturally occurring mixture of chemicals found in certain chrysanthemum flowers Pyrethrum was first recognized as having insecticidal properties around 1800 in Asia and was used to kill ticks and various insects such as fleas and mosquitos
  • Pyrethrin vs. Pyrethrum: Unraveling the Insecticidal Duo
    Pyrethrum refers to the naturally occurring extract obtained from dried pyrethrum flowers (Chrysanthemum cinerariifolium or Tanacetum cinerariifolium) This extract is a complex mixture of several insecticidal compounds, including pyrethrins I and II, cinerins I and II, and jasmolins I and II
  • What is pyrethrum and how is it used? - GNA
    Pyrethrum is a natural insecticide derived from the dried flower heads of Chrysanthemum cinerariifolium, a plant native to Asia and Africa It is renowned for its rapid "knockdown" effect on insects and its relatively low toxicity to mammals, making it a popular choice in pest control
  • Pyrethrins General Fact Sheet - NPIC
    Pyrethrins are pesticides found naturally in some chrysanthemum flowers They are a mixture of six chemicals that are toxic to insects Pyrethrins are commonly used to control mosquitoes, fleas, flies, moths, ants, and many other pests Pyrethrins are generally separated from the flowers





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