2. The scientific name of cicada is cicada, and its other name is cicada. Cicada larvae live in the soil and have a pair of strong digging forelegs. Using the sucking mouthparts to suck the sap from the roots of plants weakens the tree vigor, makes the branches die and affects the growth of trees. Usually I will stay in the soil for several years or even more than ten years, such as three years, five years, and 17 years. These numbers have one thing in common, and they are all prime numbers. This is because there are few factors of prime numbers, which can prevent them from drilling out with other cicadas and competing for territory and food when drilling out the soil. When you are about to emerge, drill out the surface at dusk and at night, climb to the tree, then grasp the bark and molt and emerge. When a black crack appeared on the back of the cicada pupa, the process of molting began. The head came out first, and then the green body and wrinkled wings were exposed. stop for a minute hardened the wings and deepened the color, and began to take off. The whole process takes about an hour.