When choosing an insecticide, you should first consider the type of pest, the type of crop, and the environmental impact. Here are some common farmland insecticides for your reference: 1. Chlorantraniliprole: Applicable to a variety of pests, with good systemic and persistent effects. 2. Avermectin: Effective against many leafhoppers and mites, with good biodegradability. 3. Imidacloprid: A neonicotinoid insecticide that is suitable for a variety of pests, especially piercing-sucking mouthparts. 4. Thiamethoxam: Applicable to a variety of pests, especially dipteran insects. 5. Bacillus thuringiensis (Bt): A biological insecticide that is effective against the larvae of some pests, especially commonly used in organic farming. Before using any insecticide, always read the label and follow the instructions for use to ensure safety and effectiveness. In addition, attention should be paid to the problem of insect resistance and different types of pesticides should be rotated rationally to reduce the risk of resistance. Finally, trying integrated pest management (IPM) strategies, including the introduction of natural enemies, can also help reduce the use of pesticides.