from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several Old World plants of the genus Chrysanthemum, such as C. coccineum, cultivated for their showy flower heads.
- n. An insecticide made from the dried flower heads of Chrysanthemum cinerariifolium or C. coccineum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of several perennial African plants of the genus Chrysanthemum, especially Chrysanthemum cinerariaefolium
- n. Any of several insecticides obtained from these plants; pyrethrin
from The Century Dictionary and Cyclopedia
- n. A plant of the genus Pyrethrum; feverfew.
- n. [capitalized] A former genus of composite plants of the tribe Anthemideæ, now included as part of the section Pyrethra in the genus Chrysanthemum, from which it was distinguished by achenes nearly equally from five- to ten-ribbed and crowned with a pappus, characters now known to vary in the same species.
- n. A powdered preparation of pyrethrum, used as an insectifuge. Also called pyrethrum-powder. See insect-powder and buhach.
- n. In pharmacy, the Anacyclus Pyrethrum, or pellitory-of-Spain.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. made of dried flower heads of pyrethrum plants
- n. white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
- n. used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
- n. 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
This unique form of incense makes use of a natural plant compound called pyrethrum which is derived from Old World plants of the genus
This unique form of incense makes use of a natural plant compound called pyrethrum which is derived from Old World plants of the genus Chrysanthemum.
Plant-derived and metallic insecticides such as pyrethrum, lead arsenate and copper sulfate had been tried but did not work well.
Or investing in the agricultural sector so farmers are more able to meet demand for crops like Artemesia annua and pyrethrum, easily-grown botanical ingredients in anti-malarial drugs?
Mosquitoes seem to be getting used to pyrethrum, the insecticide used to impregnate bed nets.
The British settler her father worked for was furious: who was going to pick his pyrethrum?
More recently, forests have been cleared for banana, bean, and tree tomato farms, while grasslands are converted to cropland for beans, potatoes, and pyrethrum.
I guess since the product was natural, the endocrine disruption from an organic product is acceptable and part of the cycle of life, sort of like letting your animals become sick and frail, or using the human nerve-disruptor “organic” pyrethrum as a pesticide, er, I meant “plant input”.
In the past, the main threats were conversion of the habitat to tea and coffee plantations, pyrethrum plantations and to both large - and small-scale farms.
Cultivation poses the other severe threat to the integrity of the ecoregion, as land is increasingly being converted to crops such as tea, coffee, banana, finger millet, potatoes, and pyrethrum.