The larval stage of cicada is called cicada monkey, cicada monkey or cicada turtle. The largest cicada is 4 ~ 4.8 cm long and its wings are dark brown at the base. It is harmful for trees to crow loudly in summer, and it is harmful for trees to suck tree juice with acupuncture mouthparts. Larvae inhabit the soil to suck root juice. The shell of cicada can be used as medicine.
Cicada is a large herbivorous insect, usually about four or five centimeters long. Their needle-like hollow mouths can pierce trees and suck sap. There are also different kinds of cicadas with similar shapes and different colors. Cicada has three less sensitive eye spots between its eyes and a simple supporting tubule on its wings. These are the primitive characteristics of ancient insect populations.
Cicada larvae live in the soil, suck the juice from the roots of plants, weaken trees, make branches die, and affect the growth of trees. Grasshopper larvae live in the soil all their lives. When it is about to emerge, drill out of the ground at dusk and night, climb onto the tree cicada, and then grab the bark to shed its skin and emerge. At the end of June, larvae began to emerge into adults, and the longest life span was about 60 ~ 70 days. Female adults began to lay eggs in late July, and the peak of laying eggs was in early and middle August. Most of the eggs were laid on branches with a thickness of 4 ~ 5 mm. When laying eggs, female adults first punctured the bark with an ovipositor, inserted the ovipositor into the branches to form claw-like egg holes, and then laid eggs in xylem. Each spawning hole has 6 ~ 8 eggs. There are more than 90 cicada eggs on a branch. Trunks and dead branches are common in late autumn in areas where this kind of insect occurs seriously. The laid eggs will hatch in the middle of June of the following year. After hatching, the larvae fall from the branches to the ground and then drill into the soil. Larvae live in soil for several years (cicada larvae in forests on the east coast of North America can live underground for the longest time 17 years) and molt for five times. Whenever spring is warm, the larvae move upward and suck the juice from the roots of plants. When autumn and winter come, they go deep into the soil to avoid the cold. Larvae's body is mostly white or yellow, very soft, and the forehead is obviously enlarged. The mature larvae are hard, yellow-brown, and have developed wing buds. There is an molting line from the top of the head to the center of the chest and back, which is the cracking line of adults when they emerge.