Pyrethrin
The pyrethrins are a whole of substances derived from the flowers of pyrèthre of Dalmatie or some Chrysanthème S, in particular the Chrysanthème of Persia ( Tanacetum coccineum ). These plants contain of it in their fabric a weak concentration. The pyréthre being a plant of altitude, its flowering is really abundant that above 1.600 Mr.
Extracted mainly the flowers, this substance is made up of different chemical principles which have the property to tackle the nervous system of the insects and are shown also toxic for fish.
These substances have an importance in Toxicologie. while causing at the living beings which introduce them an inhibition of the repolarization of the sodic Canal, involving various clinical signs like Vomissement S, Nausée S as well as Convulsion S. Cependant, they are unstable, its biodegrability is important as soon as the substance is exposed with the light.
With weaker amount, pyrethrin has an activity Insecticide or repulsive. She is regarded as one of insecticides among surest for a use by the gardeners amateurs, more especially as the warm-blooded animals are insensitive there.
It is theoretically possible to manufacture an insecticide containing the pyréthre by using powder of macerated dried flower 48 hours in water, however the solution obtained must be immediately used under penalty of fast biodegrability. Finally best the way of using the properties of these plants and of installing a few feet in the solid masses of them surrounding the kitchen garden.
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