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pyrethrum    
n. 除蟲菊

除蟲菊

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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英文字典中文字典相關資料:
  • 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 Tanacetum Plant Growing Care Guide for Gardeners
    In this Gardener's HQ guide, we'll explore cultivating Pyrethrum Tanacetum plants in your garden, indoor spaces, and other settings Plant Characteristics: Pyrethrum have daisy-like blooms that help to attract beneficial insects, making them a valuable addition to an eco-friendly wildflower garden
  • 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
  • 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
  • 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
  • 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
  • Growing Guide for Pyrethrum – Chrysanthemum - Backyard Gardener
    From the Greek pyr, fire, probably with reference to fever, since the plant was used medicinally to assuage fever (Compositae) These hardy plants are admirable for a sunny border and last well as cut flowers Long known as pyrethrum they are botanically classified under Chrysanthemum





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