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Chemical weeding methods are improper, prone to poor results, or short effective period, or eradication rate; sometimes there will be phytotoxicity, but the fruit growth of the leaves and branches is inhibited, resulting in abnormal growth, and fruit and leaves fall off. Therefore, the following points should be noted when using herbicides. 1, pay attention to the type of drug and medication time: different types of herbicides have different application time. The herbicides that have been killed or killed by the foliage or contact of the plants are best to be formed over a large area of ​​young weeds, but sprayed when they have not yet been aged. If paraquat is used, spray it when the weeds are 3-4 leaf years old. 2. Pay attention to the operation method of medicines: a lot of phytotoxic herbicides will cause phytotoxicity when they come into contact with the fruit tree branches. When spraying, the sprinkler should be directed downwards and directed to avoid accidental spraying on fruit trees or intercropping. 3, pay attention to strictly control the dosage, can effectively eliminate weeds without causing waste: If you use 10% glyphosate, generally 1 kg per mu, watered 40-50 kg. To increase efficacy, add 0.1%-0.2% detergent powder. 4, pay attention to water quality: Dispensing water should be clean without pollution, do not hard water, muddy water, muddy water, do not mix with alkaline pesticides, fertilizer spray. 5, pay attention to safe medication: Most of the agents have harmful effects on the human body, should try to avoid touching the skin and eyes, once contact will cause irritation, allergic symptoms, should immediately rinse with water. 6, pay attention to the cleaning and storage of equipment: sprayer should be cleaned, or easy to cause parts corrosion. The sprayer is best used as far as possible, so as not to spray other pesticides and foliar fertilizers as much as possible, so as to avoid accidental injury. 7, pay attention to alternate medication: spraying multiple sprays of the same agent will reduce the weeding effect, an agent generally can not be used continuously for more than 3 years.