3 example sentences using pyrethrum.
Pyrethrum used in a sentence
Pyrethrum in a sentence as a noun
I actually remember the first time I used Wikipedia, in '02 or '03, while researching pyrethrum insecticide in high school.
When I compared the organic chemicals copper sulfate and pyrethrum to the top synthetics, chlorpyrifos and chlorothalonil, I found that not only were the organic ones more acutely toxic, studies have found that they are more chronically toxic as well, and have higher negative impacts on non-target species.
Organic pesticides include rotenone, which has been shown to cause the symptoms of Parkinson's Disease and is a natural poison used in hunting by some native tribes; pyrethrum, which is carcinogenic; sabadilla, which is highly toxic to honeybees; and fermented urine, which I don't want on my food whether it causes any diseases or not.
Pyrethrum definitions
made of dried flower heads of pyrethrum plants
white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
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
used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
See also: Pyrethrum