Cypermethrin is a chemical formula of C₂₂H₁₉CL₂NO₃, its industrial product is yellow to brown viscous solid, and it is viscous liquid at 60℃. It's a kind of insecticide. It is moderately toxic and stimulates skin and mucous membranes. Cypermethrin decomposes into cyanide gas when heated over 220℃.

Cypermethrin has strong contact toxicity and gastric toxicity, and repellent effect on insect pests. It has certain killing effect on the eggs of some lepidopteran pests. Strong knockdown effect and fast killing speed. The insecticidal spectrum is broad and has special effects on lepidopterous pests. It has good effect in preventing and treating insect pests which are resistant to organophosphorus insecticides. In the field, 4060 milliliters of 10% millage oil are used in general mu, and 15 - 30 milliliters for aphids, inchworm and thrips can receive good results. The pests of fruit, forest, tea and mulberry are controlled, and 2000-3000 times of liquid spray of 10% milk oil are used.

Attentions:
Cypermethrin is highly toxic to aquatic organisms such as fish, bees and silkworms, and is used cautiously in fish ponds and silkworm areas.