Cicada, also known as cicada, is black and old, belonging to the Homoptera Cicadaceae. The insect is distributed all over the country, generally occurring below 250 meters above sea level. Harm pear, jujube, apple, apricot, plum, peach, cherry, mulberry, grape and willow, locust, poplar, elm and other trees. Its larvae live in the soil and suck the juice from the roots of plants, which weakens the trees, causes the branches to die and affects 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, the larvae began to emerge into adults, and their 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 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. ?