The Chinese parasol tree is an excellent roadside tree in northern China. It is widely used in urban afforestation, with smooth trunks, luxuriant foliage, and beautiful leaves with good shading effect. However, the hazards of the Chinese paulownia tree lice are great, which greatly affects its ornamental effect. After a long period of observation, the writer has a certain understanding of the occurrence and damage laws of the paulownia hibiscus, and has carried out effective prevention and control and accumulated the following experience. Hazard characteristics and symptoms Indus hibiscus, also known as the green paulownia culm, and the indus scorpion culm, belong to the family Homoptera. The use of nymphs and adults to suck sap on the backs or young stems of sycamore trees destroys the tissue, especially the saplings. The damage to the saplings is yellow, and the tip of the plant is withered. The nymphs secrete white cotton wool-like waxy material, blocking the leaf stomata, affecting the normal photosynthesis and respiration of the leaves, causing the leaves to show pale and atrophic symptoms; when the wind is blowing, the white wax wire flutters in the wind and looks like flying fog. Seriously pollute the surrounding environment and affect the appearance of the city. Morphological characteristics The adults are yellow or green, and the body color changes greatly. The green midbrain plate is mostly yellow, the back of the chest is yellow, the length is 4 mm to 5 mm, the wingspan is about 13 mm, the compound eyes are dark brown, and the antennae are filamentous. Yellow, the last two black silk. The eggs were slightly spindle-shaped, slightly pointed at one end, and approximately 0.7 mm long. They were yellowish-white or yellow-brown when they were first born, and turned reddish-brown before hatching. The nymphs of the last instar were slightly cylindrical and were thickened with white wax. The whole of the nymph was grayish and slightly greenish, with a body length of 3.4 to 4.9 mm. Biological characteristics The adults and nymphs of this insect are all clustered, often over ten to dozens of heads are clustered on tender shoots or branches and leaves, but mainly on shoots and leaves. The nymphal insects all live in waxy floc, and the insects move quickly and without jumping ability. Adults always crawl and rarely fly after emergence. If they are disturbed, they fly to help fly. Spawning eggs, each female can lay about 50 eggs, egg period 10 to 12 days. Adults live about 42 days. In Zhengzhou, Henan Province, this worm occurs 2 generations a year. Overwintering eggs, in early May of the following year, the wintering eggs hatched. In the nymph period of more than 30 days, the birds began to emerge in early June and emerged in the late days. The second generation of nymphs hatched in mid-July and the second generation of adults appeared in the middle and mid-August. In late August, spawning took place, mainly in the main branch below the main branch, under the side branches or under rough surface at the winter. Control methods First, spraying water to remove floc in the hazardous period can eliminate many nymphs and adults. Second, spray 10? imidacloprid WP 2000 times or 1.8% avermectin EC 2500 to 5000 times, plus detergent 300 to 500 times the liquid, improve efficacy, 10 days before spraying 1, control, Nymphs are better. Third, in the early stages of nymphs or in the early stages of development, they are first sterilized and sterilized using a 100-fold dilution of the ecological arrow, then sprayed with Green Dan II, diluted 1500 times, or directly injected into the trunk with a tree insecticide. The control effect is very high. effective. Fourth, combine the winter shear, remove the excess lateral branches. In addition, 33 pounds of lime, 0.5 pounds of cow leather, 2 to 3 pounds of salt, dubbed a white paint, smear the trunk, eliminate overwintering eggs. Fifth, pay attention to the protection and use of parasitic bees, ladybugs, grasshoppers and other natural enemies. Fresh Lemon Fruit,Fresh Lemon Turkey,Fresh Lemon Seedless Lime,Fresh Fruit Yellow Lemon Laiwu Manhing Vegetables Fruits Corporation , https://www.manhingfood.com