What are the prevention and control methods of aphids?

What are the prevention and control methods of aphids? There are no netizens to help introduce the prevention and control methods of aphids in the farming network, which are listed in detail below for netizens' reference. Method 1. Make rational use of the natural enemies of aphids: there are many kinds of natural enemies of aphids, such as ladybugs, lacewings, aphid-eating gadflies, flower bugs and aphid cocoon wasps, aphid mold and so on. Where there are aphids, there are these natural enemies, if there are more of these natural enemies, the damage of aphids can be controlled. Therefore, when the number of aphids in the field is not very large, and there are a certain number of natural enemies, do not apply medicine blindly, so as not to kill natural enemies, but lead to aphid damage. When the ratio of the total number of natural enemies to the total number of aphids in the field is less than 1:80-100.There is no need to apply pesticides in the field, and the role of natural enemies in killing aphids can be played completely. Method 2. Scientific fertilization without partial application of nitrogen fertilizer: aphids like to eat carbohydrate food. in cultivation and management, one-time application of too much nitrogen fertilizer, especially excessive urea, will cause a sudden increase in carbohydrates in crops. resulting in a sudden increase in aphids in a short period of time. Therefore, controlling the excessive application of nitrogen fertilizer is an effective method for the control of aphids. Method 3. Timely prevention and control of aphids before migration: aphids are mainly caused by the migration and spread of winged adult aphids. therefore, it is one of the economic and effective ways to control aphids by seizing the prevalent period of winged nymphs before migration. Method 4. Master the site of pesticide application: aphids generally gather in the tender head, tender leaf, young stem and back of the leaf, so it should be aimed at the tender part of the middle and upper part of the damaged crop, so that it is targeted, economical and effective. Method 5. Alternate use of pesticides: aphids have strong reproductive ability and occur for many generations, so they are easy to produce drug resistance. If a certain pesticide is used to control aphids for a long time, soon this pesticide will have no effect on it. Therefore, aphid control pesticides can not be used continuously for a long time, and generally a pesticide can be used twice at most in the same place, which can effectively overcome and delay the resistance of aphids and achieve the goal of less drug use and high benefit. Method 6: select the right control agents: each pesticide variety has its own specific control object, if not selected properly, the effect is not good, but also will suffer losses. At present, there are many pesticides with good aphid control effect, such as Yuanjing, Quanshaling, dichlorvos, high osmotic long-acting phosphorus, omethoate, killing aphids, aldicarb, and so on. Generally speaking, it is better to give priority to the selection of high-quality new pesticides suitable for the local area. Click to get more pesticide application techniques