Cyprodinil is a pyrimidinamine, systemic fungicide. It mainly acts on the invasion period and hyphae growth period of pathogenic fungi. By inhibiting the biosynthesis and hydrolase activity of methionine in pathogenic bacteria cells, it interferes with the fungal life cycle, inhibits the penetration of pathogenic bacteria, and destroys the growth of mycelium in plants. It has no cross-resistance to triazoles, imidazoles, morpholines, dicarboxylic acid imines, and phenylpyrrole fungicides, and is extremely resistant to gray mold and spotted leaf disease caused by deuteromycetes and ascomycetes. Good control effect, very suitable for comprehensive disease management.