To prevent early leaf-falling diseases of apples, we should start by raising and strengthening the roots. The base fertilizer should be mainly decomposed farmyard manure, and apply more compound microbial fertilizers in the soil. We should pay attention to fertile field armor, also called silicon calcium magnesium potassium, and use it appropriately. Apply potassium sulfate compound fertilizer. Add Mumeituli compound microbial fertilizer when topdressing, or add Mumeituli biological control function water-soluble fertilizer when fertilizing, to improve the soil, fertilize the soil, enhance tree vigor, inhibit pathogens, and improve the stress resistance of apple trees.