1. Reasonable concentration : When spraying with fungicides (including water and wettable powders), it is necessary to formulate or dilute the agent to an appropriate concentration with water. Different fungicides have their own special requirements for the concentration of the fungicide. When configuring the concentration, it must be strictly in accordance with the instructions on the outer packaging of the product, and should not be increased or reduced at will. If the concentration is too high it can easily lead to injury, the concentration is too low to achieve the effect of drug use prevention and treatment of disease. 2, select the time of spraying : In general, spraying the fungicide too late or too early will affect the control effect. Premature spraying time not only causes waste, but also reduces the control effect. When the spraying time is too late, a large number of pathogenic bacteria have invaded the host or caused harm. At this time, even if the therapeutic agent is sprayed, it is half the effort. Therefore, the use of fungicides should be based on the occurrence of different diseases of crops and the forecast data of agricultural plant protection departments and the specific conditions of disease occurrence. Usually, the time of administration of the fungicide should be in the pre-onset (protective use) or early onset (preventive). 3. Master the number of medications : The number of sprays of fungicides is mainly determined according to the length of the residual period of the medicament and meteorological conditions. Usually spray every 10 to 15 days, a total of 2 to 3 times. In case of special circumstances, such as rain after application, it should be replenished in time. 4. Improve the quality of medication : The quality of the spray of the fungicide includes the amount of the drug and the quality of the spray. The amount of medication should be appropriate, and too much medication will increase the cost on the one hand, and it will easily cause phytotoxicity on the other hand. However, too little medication can not achieve the purpose of medication. The quality of the medication should be exquisite. When spraying, it is required to be finely fogged and sprayed evenly. It should be sprayed on the stems of the plants and the front and back of the leaves, so as to avoid leaking. 5, strict prevention of phytotoxicity: bactericides cause phytotoxicity for a variety of reasons, first of all, generally highly water-soluble agents are prone to phytotoxicity, and secondly different crops have different sensitivities to the pharmacy, such as Bordeaux liquid generally does not cause phytotoxicity However, copper-sensitive crops may also cause phytotoxicity. Beans and potatoes are sensitive to stone sulphur, and the chance of phytotoxicity is high. The different growth and development stages of the crops react differently to the chemicals, and the seedlings and the flowering stages of the booting are prone to phytotoxicity. In addition, phytotoxicity and meteorological conditions such as temperature, sunshine, etc. also have a certain relationship, generally high temperature and drought, strong sunshine or fog, high humidity and other conditions are likely to cause crop phytotoxicity. 6. Cautious drug mixing : Many fungicides are alkaline pesticides , so they can not be mixed with insecticides that are easily decomposed and decomposed by alkaline substances. For example, Bordeaux mixture, stone sulfur mixture, etc. are alkaline and cannot be mixed with dimethoate, dichlorvos, etc. Use, otherwise it will cause both losses. Some fungicides such as carbendazim and Beauveria bassiana can not be mixed with Bordeaux mixture, stone sulphur mixture, thiophanate and other fungicides, which also cause the insecticidal (bacteria) microorganisms to lose physiological activity and insecticidal (bacteria) ability. Invalid. . Of course, not all fungicides can be mixed with other pesticides. A small number of fungicides can also play a synergistic role when mixed with pesticides. For example, dimethoate mixed with acidic bactericidal properties such as zinc or wet sulphur or colloidal sulphur will not only affect the efficacy of the drug, but also improve the efficacy. 7. Pay attention to avoiding drug resistance : the use of fungicides also has the problem of resistance to crop diseases. Long-term use of a single agent (mainly a systemic fungicide) can lead to resistance to pathogens, even if repeated use of drugs does not help, Even worse. In order to avoid disease resistance, it is necessary to scientifically select pesticides, and to do the alternate (rotation) use of different types of pesticides. It is strictly forbidden to use one pesticide for a long time.
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