pyretriinit

Pyretriinit are a group of naturally occurring insecticides found in chrysanthemum flowers, specifically Chrysanthemum cinerariifolium. They are esters of chrysanthemic acid and are known for their rapid knockdown effect on insects. Pyrethrin I and pyrethrin II are the two main active components. They function by disrupting the sodium channels in the nervous system of insects, leading to paralysis and death.

While effective against a broad spectrum of insects, pyretriinit have relatively low toxicity to mammals and birds. This is due to their rapid metabolism in these animals. However, they can be toxic to fish and other aquatic organisms, as well as to beneficial insects like bees. Due to their natural origin and relatively low mammalian toxicity, pyretriinit are often used in organic farming and in household insecticide products.

The term "pyrethroids" refers to synthetic compounds that are chemically similar to pyretriinit but are often more stable and have longer residual activity. While derived from natural pyrethrins, synthetic pyrethroids can have different toxicity profiles and environmental impacts. Natural pyretriinit are biodegradable and break down quickly when exposed to sunlight and air.