How to control aphids in planting fruit trees?

How to control aphids in planting fruit trees? Please introduce the harm of effective and practical control methods of aphids: aphids secrete saliva when piercing and sucking plants, because these saliva are toxic to plants, so after they are injected into plant tissues, it often causes leaf spots, tender leaf curls, wrinkles, galls, tumors and other harmful forms. The excreta of aphids tastes as sweet as honey and is called "honeydew". It is often covered with flower leaves and branches, and the accumulation of these dark substances blocks the stomata on the leaf surface, blocking the physiological function of plants and causing coal fouling disease in plants. affect plant respiration and photosynthesis. Fruit trees can refer to the following methods to control aphids: 1. Physical control of aphids. 1. Yellow board traps aphids by painting fibreboard, wood or cardboard yellow, applying sticky materials such as No. 10 engine oil or Vaseline to trap winged aphids, and then changing the color plate in time. 2. Silver gray has a strong tendency to avoid aphids, which can be hung with silver gray plastic strips or covered with silver gray plastic film to avoid aphids in the garden. This method has a good effect on aphid migration and transmission of virus. 3. Aphid sex pheromone avoid aphids. Drop aphid pheromone (400 ml) into a brown plastic bottle, hang the bottle in the garden, and place a water basin under it, so that the induced aphids fall into the water and die. Plant control 1, 1 kg of dry tobacco leaves soaked in 10 kg of hot water, kneaded and fished out, soaked in 10 kg of water for one night, then rubbed and filtered. Mix the filtrate twice and spray evenly with 10 kg of aqueous solution containing 0.5 kg of lime. 2. Orange peel dried orange peel 1 kg and dried pepper filter 0.5 kg, mix and mash, boil with 10 kg of water, soak for 2 days, the filtered extract can be sprayed. This liquid has a contact killing effect, and aphids die soon after being treated. 3. The castor leaves were soaked in twice as much water with fresh castor leaves, boiled for 15 minutes and sprayed. 4. Plant ash can be sprinkled directly when avoiding aphids in a single tree. When trees are often soaked in 50 kg water for 24 hours, 10 kg of hay ash per mu is used and filtered out. 25 grams of 80% crystal trichlorfon is added to the filtrate (or not), mixed and sprayed to control aphids, cabbage insects and other pests. Spray once every 7-8 days, three times in a row, and the effect is good. 5. Plant ash is specially used to treat pear wood lice, pear wood lice nymph is surrounded by a layer of mucus, when the harm is serious, the control effect of conventional medicine is not great. The filtrate was extracted with 3% plant ash and sprayed on the trees damaged by pear planthopper. After 3-4 hours, the mucus of the coated nymph disappeared, the nymph was exposed, and then spraying pesticides to control pear planthopper, such as spraying 1.8% avermectin 3000 times, the control effect was greatly improved. Trunk coating is mainly used on disease-free and strong trees. It takes effect in 3-5 days, and the effect is maintained for 3 months. At the base of the trunk 30cm from the ground, pick a smooth place, scrape off 7cm of bark to expose the phloem, then wrap it with a layer of cotton or old newspaper soaked in 40% dimethoate EC 5x 10 times, and then wrap it with a plastic film from the outside. What are the reasons for the dead branches and yellow leaves of fruit trees? remove the plastic film after a week, and remove cotton and newspapers. There are more than 80 species of natural enemies such as ladybug, lacewing, aphid fly, flower bug, aphid cocoon wasp, aphid Xiaofeng and so on, which can be introduced, propagated or released. In the season when natural enemies multiply in large numbers, try to reduce the frequency of medication or choose low-toxic pesticides. In the late period of wheat harvest in mid-June, a large number of ladybugs were transferred to fruit trees, so aphids could be eliminated without drugs in fruit trees during this period. Chemical agents with high efficiency, low toxicity and low residue should be selected as far as possible, and a variety of pesticides should be used alternately to delay the emergence of aphid drug resistance. For example, 10% imidacloprid wettable powder 2000 times liquid, 1.8% avermectin 3000 times liquid, 2.5% kungfu EC 1000 times 1500 times liquid and so on. Click to get more fruit planting techniques click to get more pesticide application techniques click to get more pesticide application techniques