1 Nerve agent. The nervous system acting on pests, such as DDT, parathion, carbofuran, pyrethrin, etc.
2 Respiratory agents. A respiratory enzyme that inhibits pests, such as hydrogen cyanide.
3 Physical poisons. For example, mineral oil can block the pest valve, and the inert powder can grind the epidermis of the pest and cause the pest to die.
4 Specific insecticides. Inducing physiological abnormal reaction of pests, such as repellents that make pests away from crops, attracting pests with sexual attractants or baits, so that the pest taste is inhibited and the antifeedant that no longer feeds on hunger is killed. An infertility agent that acts on the adult reproductive machine to make one male or female infertile or both sexes, and an insect growth regulator that affects the growth, metamorphosis and reproduction of pests.