In recent years, in order to ensure the construction of "Lvyang City and Ecological Yangzhou", the task of afforestation in Yangzhou has increased significantly. Poplar has become a main planting tree species in the city due to its wide variety of suitable areas, rapid growth, excellent materials, wide use, and high benefits. However, the planting of a large area of ​​pure poplar forest has also brought about a negative impact, resulting in a variety of pests and diseases of poplar trees. This year, some areas (counties) of our city have a large area of ​​poplar spider mites, also known as cockroaches. The red spiders that endanger the poplar in our city are mainly Hawthorn leafhoppers, red spider mites, common name red sand, fire dragon bugs, and firewood seeds. They are widely distributed. The host plants include hawthorn, peony, locust, paulownia, populus euphratica, and white poplar. There are trees such as peaches, plums, and grapes. Harmful poplars are mainly saplings of the current year. They are harmful to the leaves, buds, and tender stems of poplar trees. In the early stages, they often appear as yellow-orange spots, and gradually expand. Turns brown or reddish brown patches, or leaves curled, causing leaves to fall off when severe, deformed stems. According to the characteristics of the city's climate and environment, strengthening the management of poplars, especially newly planted trees, is an important measure to reduce the incidence of insect pests. First, the morphological characteristics: adult female ovoid body oval, dorsal bulge, black wrinkles on both sides of the body back, there are 26 bristles, into 6 columns. Body length is divided into winter and summer type, summer type individuals are large, about 0.6-0.7 mm long, the beginning of red, dark red later, the winter type of body smaller, about 0.4 mm, red scarlet. Shiny, non-overwintering type is dark red. Male diamonds, 0.4 mm long, slightly pointed at tip, light green or light green. There are dark spots on both sides of the back of the body, and the hooks of the male stem are bent almost at right angles. Biological characteristics: 5 to 10 generations in 1 year, with purple clusters in gaps, barks, litters, and overwintering in the topsoil near the trunk. The wintering females are very resistant to cold. When the buds are sprouting, the wintering eggs begin to hatch, and the hatching period lasts in mid-May. The young cubs climbed on the young leaves to feed on the food and bred to the nymphs to breed eggs. The first generation of females has a life span of about 15 days. The average egg production per female is 43 grains, which endangers most poplar leafhoppers, harms the middle and lower part of the canopy, and the back of the inner canopy, which mainly harms the new leaves. The cluster is on the back of the leaves and sucks the nutrient of the juice of the leaves, making the leaves from the handle to the veins green and yellow, the back turned into red rust, the color is dull, and then shedding, causing the poplars to produce early leaves and stop growing early. The late growth of the tree has a great influence. When the temperature is appropriate, its reproduction is rapid, and each generation overlaps from June to August. Therefore, when the climate is dry from June to July, the risk of explosion is greatest. The transmission methods include crawling, wind transmission and transmission with people, animals, fruits and saplings. Third, the prevention and control methods: 1, artificial control, spring before sprouting, Hawthorn red spider to female adult cicada overwintering in the cracks in the branches. Therefore, scraping the skin and focusing burns can eliminate a large number of females. It has a good effect on the control of red spiders. 2, biological control, there are beam tuber soup ladybugs, deep-spot ladybugs, meat thrips, small flowers, grasshoppers, whiteflies and predators. These natural enemies can suppress the reproduction of hawthorn leafhoppers in the middle and late stages. 3, chemical control, use of high-efficiency, low toxicity, low residual pesticides, can choose 1.8% Insect grams of EC 4000-5000 times, or 2.5% Uranus EC 2000 times, or 21% to kill EC 2500 times, or 5% stuck emulsifiable concentrate 2000 times, or 40% dimethoate 800 times, or 73% chlordecone 2000-2500 times, spraying.
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