First, pay attention to rational use of drugs, delay the emergence of drug resistance
　　 1. Avoid long-term single use of drugs. Selecting a new variety of pesticides for single use of drugs is likely to cause resistance to pests and diseases and reduce control effects. New varieties can reduce the number of medications, reduce production costs, improve control effects, and slow down the development of resistance.
　　 2. Master the appropriate dosage and concentration of the drug solution. Too high a concentration of pesticides causes pesticide residues to exceed the standard, causing phytotoxicity in severe cases, and also increases the resistance of the bacteria, and the preparation of the multiples of the liquid must be strictly carried out according to the instructions.
　　 3 , control the number of application, master a reasonable interval, too many times of application, the interval is too short, easy to produce phytotoxicity.
Second, pay attention to the key period of disease prevention, early prevention
　　 1. Seedlings during seedling period are small, have weak disease resistance, and are susceptible to infection by bacteria. A protective fungicide should be sprayed to ensure that the seedlings are not affected by pathogens.
　　 2. After planting the seedlings, the growth rate of the plants is accelerated, and the disease is easy to occur. A protective spray should be carried out to form a protective film around the plants to prevent the infection of the bacteria.
　　 3 , after the flowering results in the young fruit period, from vegetative growth to reproductive growth and vegetative growth, the leaves are poorly nutritious and susceptible to disease, and should be sprayed in time.
Third, pay attention to improve the spraying technology to ensure the quality of medication
　　 1. Spraying should be comprehensive. Spraying should be done without leakage, no heavy spray, no leakage, no leakage. Spray from the bottom of the plant to the top, spray evenly on the front and back .
　　 2 , to focus on the spray. The susceptible disease around the central diseased plant should be sprayed with focus, and the upper and middle leaves of the plant are susceptible to disease.
　　 3. Determine the spraying time. Under normal circumstances, when the light is strong, the temperature is high, and the humidity is high, the transpiration, respiration and photosynthesis of the crop are strong, and the pores on the surface of the stems and leaves are open, which is beneficial to the entry of the medicament, and the humidity is large, and the drying speed of the liquid on the leaf surface is slow. Easy to absorb and enhance the efficacy. However, if the light is too strong and the temperature is too high, it may cause photolysis or phytotoxicity of the agent, so it is not advisable to spray before and after noon.
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