Taphrina deformans is a fungus and plant pathogen, and a causal agent[s] of peach leaf curl.[1] Peach trees infected with T. deformans will experience leaf puckering and distortion, acquiring a characteristic downward and inward curl. Leaves will also undergo chlorosis, turning a pale green or yellow, and later show a red or purple tint.[2] Fruit can either drop prematurely or show surface distortions.[3] Severe infection can also produce lesions on the flowers.[2] The host tree will experience defoliation if the leaves are badly diseased. If a seedling is severely infected, it may die.[4] Almond trees display similar symptoms.[2]