Improve its ability to resist pests and diseases and adapt to different environments. The reason why citron trees need to be grafted is because citron trees have relatively poor adaptability to soil and climate and are vulnerable to various diseases and insect pests. By grafting, citron trees can be combined with other varieties of citrus trees, thus improving their ability to resist pests and diseases and adapt to different environments. Citron tree is a fruit tree of Citraceae, also called sweet orange. It is a variety of citrus, which is widely planted all over the world. Citron fruit tastes sweet and sour, and is rich in nutrients such as vitamin C. It is one of people's favorite fruits.