Standards for the use of vegetables: agricultural control, physical control, biological control, supplemented by chemical control. The following is a detailed introduction by the China Pesticide Network :
First, rational use of drugs to delay the emergence of drug resistance
1. Avoid long-term single use of drugs, and choose a new variety of pesticides. Single drug use can easily cause resistance to pests and diseases and reduce control effects.
2. Grasp the appropriate dosage and concentration of the drug solution. Excessive application concentration causes the drug residue to easily cause phytotoxicity, and it also increases the resistance of the bacteria. The preparation of the drug solution should be carried out in strict accordance with the instructions.
3, control the number of application, master a reasonable interval of application, the number of times too much, the interval is too short, easy to produce phytotoxicity.
Second, the key period of disease prevention, early prevention
1. During the seedling stage, the seedlings are small and the disease resistance is weak and susceptible to pathogen infection. A protective fungicide should be sprayed to ensure that the seedlings are not infected by the bacteria.
2. After planting the seedlings, the growth rate of the plants after the slow seedlings is accelerated, and the disease is prone 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, improve the spraying technology to ensure the quality of medication
1. When spraying, you should do not spray, do not spray, do not leak, or leak trees. Spray from the bottom of the plant to the top, spray evenly on the front and back.
2. When spraying, it is necessary to grasp the susceptibility to the disease around the key central disease plant, and focus on the upper and middle leaves of the plant.
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 stem and leaves are open, which is beneficial to the entry of the medicament, and the drying of the surface of the large leaf of the humidity is slow, and the pesticide is easy. Absorbs to 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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