Apples , deciduous trees, oval leaves, white flowers with blush. The fruit is round, sweet or slightly sour. It is a common fruit with rich nutrients and has the functions of diet therapy and auxiliary therapy. Apples are native to Europe, Central Asia, West Asia and Turkey, and were introduced to China in the 19th century. China is the world’s largest apple producer, cultivated in Northeast, North, East, Northwest, Sichuan, Yunnan and other places.