Insecticide is an agent that kills pests, such as beetles, flies, cockroaches, larvae, hoppers, and nearly 10,000 other pests. The use of insecticides has gone through several stages: the first to discover natural insecticides and inorganic compounds, but they have a single effect, a large amount, a short duration; organic synthesis of organochlorine, organophosphorus and carbamate. Insecticides, which are characterized by high-efficiency, high-residue or low-residue, many of which have high acute toxicity to mammals.

It is mainly used for the control of agricultural pests and urban sanitary pests. It has a long history, large dosage and variety. In the twentieth century, the rapid development of agriculture and pesticides caused agricultural production to rise. However, almost all pesticides can seriously alter the ecosystem, most of which are harmful to the human body, and others are concentrated in the food chain. We must strike a balance between agricultural development and the environment and health. According to the source, it can be divided into two types: biological source pesticides and chemical synthetic pesticides.