Summer is the best time for cicadas to grow and move. 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 to the tree, 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 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 the soil for several years and molt 5 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.
On a cool summer night, cicadas are chirping in the trees. If you attack it at this time, there will often be a liquid similar to sewage overflowing from the leaves, which is cicada urine. Cicada's food is mainly the sap of trees. Cicada's mouth is like a hard tube. It sticks its mouth into the trunk, sucks the juice all day long, and sucks a lot of nutrients and water into the body to prolong its life. When it encounters an attack, it quickly discharges the waste liquid stored in the body to reduce the weight of take-off and play a role in self-defense. Cicada's excrement is different from other insects. Its excrement is stored in the rectal sac, and it can be excreted at any time in an emergency. Cicada has two pairs of membranous wings with very hard veins. When cicadas rest, their wings always cover their backs. Cicada rarely flies freely, and only flies from tree to tree when it is foraging or disturbed. Interestingly, cicadas can suck juice through straws and sing with musical instruments at the same time. Eating and singing do not interfere with each other. The chirping of cicadas can predict the weather. If the cicada chirps loudly in the treetops early, it will tell people that it is very hot today.