Leafhopper, commonly known as red spider or yellow spider, also known as fire dragon bug, is a spider arachnid, aphids, leafhoppers, and is a species of aphids. It is not an insect but an arthropod door that is widely distributed in nature. Hazardous way: The sap of the plant is sucked by the leaves of the pods and the pods on the leaves. The leaves change color and lose their greenness, showing spots and plaques, which are most likely to cause yellow leaves and early leaves. Ye Wei's host is very broad and spreads the virus in the process of harming plants. In recent years, the damage of leafhoppers has been on the rise and has become a major pest in the greening of North China. Morphological characteristics: Jade and insect jade to distinguish between the body segmentation is not obvious, no head, chest, abdominal three points, usually divided into two parts of the first half and the latter half, no wings, no compound eyes. Cubs have 3 pairs of feet. If Ju and Cheng have 4 pairs of feet, the body is tiny, 0.1 to 0.8 mm long, round or oval in shape, the eggs are milky white, transparent, and the ontogeny includes eggs, young, first If there were five periods of 螨, 螨 螨 螨 。 。 螨 and 螨 螨 , , , , , , , , , , , , , , , , , , , , , , , , , , , , 。 。 。 Body color changes, usually red, dark red, orange, light yellow, light green and other colors, body color can vary with the type of food, how much food, plant development stage and its own physiological state, sucking mouthparts, Miscellaneous food. Occurrence pattern: It takes about 10 generations a year in North China. After mid-to-late October, the female adults become overwintering in plant cracks, bark seams, earth seams, fallen leaves, and weeds in the rhizosphere. When the long leaves start to harm, rely on crawling or taking the wind, rain and carry with the host to carry. Its breeding ability is very strong. It usually reproduces for 7 to 10 days, mainly in sexual reproduction, and also in parthenogenesis. After mid-June, the temperature gradually rises. If the weather is dry and the temperature is above 30°C, The amount of maggots proliferates. It takes about 5 days to breed a generation. There are overlapping generations. From July to August, the most serious damage occurs. When a large number of occurrences occur, some of the leaves of some trees and shrubs can be completely lost, causing the trees to grow and grow for the second time. Decrease the tree body and even cause death, such as the scorpions, dragon's claws, and purple peaches. In the rainy season, the number of crickets has decreased significantly during successive heavy rains. Starting in September, if there is less rainfall, there will be a small peak of damage. Prevention and control measures: (1) Prevention and control during wintering period: For trees that are prone to mite damage, the trunk is sown at the end of autumn to trap overwintering females, and the spruce is removed and burned in early spring, and weeds and fallen leaves are removed in winter to perform centralized treatment. Reduce the density of cornices in the coming year. (2) Do a good job in predicting and predicting the timely inspection of the back of the leaves. It is best to use a magnifying glass or to drop the leaf bullets onto a white paper so as to observe and find that the pests are dealt with promptly. In the dry season, it is necessary to cool and humidify and timely watering. Compensate trees for water loss due to drought and flood damage. (3) Biological control: There are many natural enemies of leafhoppers. The insects that eat predators have food thrips, grasshoppers, deep-detailed ladybugs, black ladybirds, and small flower cockroaches. Predatory mites have vegetable mites. The long-haired dulled owls, the largo-headed crickets, the Chilean vegetative chrysalis, etc. often live together with the crickets. The individuals are slightly larger and have a reddish body color. In addition to hunting predators, they also prey on locusts. And scale insects, etc., should be protected and utilized. Conditional breeding and release of natural enemies. (4) In the case that the amount of earthworms does not affect the growth of the trees, water spray or 0.1 to 0.2 degree Baumeshi sulfur mixture granules can be sprayed when conditions permit. (5) Chemical control: When the density of leaves in the growing season is large, spraying should be timely, which is the key to prevent and control the damage of the later stage. It can spray 20% of dicofol EC 600 to 800 times, and it can be used to make 螨, Ruoqiang, The larvae and eggs have good contact killing effect and are safer to natural enemies. This drug cannot be mixed with alkaline pesticides; or use 20% triclosan WP wettable powder 800 to 1000 times for pups and Eggs have a good touch-killing effect, which can make nymphs unable to bear children; or use 5% nisolate EC 1500 to 2000 times, which has a strong killing effect on Ruoqiang, cubs and eggs. Generally, there are 2 on each leaf. It is best to use 3 to 3 times, and also to spray 20% of the WP from 2000 to 4000 times. This medicine also kills natural enemies. It can be sprayed when the disease occurs, preferably only one year. Use once.
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