It may be caused by a fungus (e.g.Taphrinia deformans causes peach leaf curl), or by viruses (e.g. tobacco and cotton leaf cur) transmitted by insects such as whiteflies (Bemisia).

• 可能由真菌类引起（例如（畸形外囊菌引起桃叶卷曲），也可能由害虫传播的病毒引起（如烟草和棉花叶卷曲）如粉虱（粉虱属）。