"Pyrethrum" Natural Recordings by Native Speakers
Pyrethrum is a natural insecticide made from the flowers of the pyrethrum daisy (Chrysanthemum cinerariaefolium). It is a mixture of pyrethrins, toxic compounds that repel and kill insects. Pyrethrum is commonly used to control aphids, whiteflies, spider mites, and other pests in gardens and agricultural fields. It is a biodegradable and non-toxic substance when used outdoors, but can be toxic to aquatic life and may cause eye and skin irritation in humans.
Pyrethroid is a type of synthetic insecticide that is derived from chrysanthemum flowers. It is a mimic of the natural insecticidal compounds found in these flowers, known as pyrethrins. Pyrethroids are commonly used in insecticides, sprays, and powders to control and kill a wide range of insects, including pests that are resistant to other types of pesticides. They work by rapidly killing the insect's nervous system, causing paralysis and death.<br><br>Pyrethroids are also used in veterinary medicine to treat external parasites such as ticks, fleas, and mites. However, they can also be toxic to mammals if ingested in large quantities, and can have adverse effects on aquatic life.<br><br>Some common types of pyrethroids include:<br><br> Permethrin<br> Resmethrin<br> Cypermethrin<br> Deltamethrin<br> Fenvalerate<br><br>Pyrethroids are generally considered to be relatively safe for humans and the environment, but they can still have some adverse effects if used improperly or in excessive quantities. Therefore, it is essential to follow the instructions on the label and take necessary precautions when using pyrethroid insecticides.