Pyrethrins is the main raw material for the preparation of mosquito incense, and is the insecticidal active ingredient contained in the perennial herbaceous pyrethrum of the Compositae family. There are mainly pyrethrin I and pyrethrin II, and a small amount of pyrethrin I and pyrethrin II with similar structures. At present, a variety of compounds similar to natural pyrethrins have been artificially synthesized as insecticides, collectively referred to as pyrethroids. Pyrethrin is a yellow viscous oily liquid with a delicate fragrance. It's insoluble in water, soluble in many organic solvents. It's unstable, decomposes and fails when exposed to alkali, and decomposes and fails under strong light or high temperature.

Mainly used to prevent and control sanitary pests and livestock pests. It is very safe for humans and animals, has no phytotoxicity to plants, no residues, and does not pollute agricultural products and the environment. Safe for warm-blooded animals. In terms of virulence to insects, pyrethrin I was the strongest, pyrethrin was the second, pyrethrin II was the second, and pyrethrin II was the weakest. 

Pyrethrins 50% 8003-34-7 is mainly used as indoor insecticide because it is stable under heat and light conditions. Some shampoos that kill head lice also contain pyrethrin. Pyrethrins are mainly used in agriculture and gardening to kill construction pests (such as termites), lice and fleas. Pyrethrin and synthetic pyrethrin can quickly penetrate into the body of the pest, causing it to paralyze.