From insect embryology shows: insect digestive tract before the same body wall hindgut and sources, are the tip of the embryo developed from the ectoderm. Before and after intestinal worm body wall retraction is Avi formed lore granules, so this is the role of agents with contact and was also before and after intestinal stomach poison insect digestive tract. Pesticides are mainly used to control agricultural pests and city health pests drugs. History of long-term use, dosage, and more varieties. In the twentieth century, the rapid development of agriculture, pesticides make agricultural production soared. However, Shanghai 3% avermectin nematode lore granules, almost all pesticides are severely alter the ecosystem, most harmful, others are concentrated in the food chain. We must strike a balance between agriculture and the environment and health in development. According to sources can be divided into two categories biogenic synthetic pesticides and chemical pesticides.