Vegetables should pay attention to the problem

Over the years, people have been advocating the principle of harmless prevention and control of pest control by “agricultural control, physical control, biological control, supplemented by chemical control”. However, in order to ensure stable and high yield of vegetables, it is inevitable to use a variety of pesticides. So, what should you pay attention to when spraying pesticides ?

First, pay attention to rational use of drugs, 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. New varieties (not frequently used locally) can reduce the number of medications, reduce production costs, improve control effects, and slow down the development of resistance.

2. Mastering the appropriate dosage of the drug and the concentration of the drug solution are too high, causing the drug residue to easily cause phytotoxicity, and also increase 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 the reasonable interval of application times too much, the interval is too short, easy to produce phytotoxicity.

Second, pay attention to 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 and slowing down the seedlings, the growth rate of the plants 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, the Chinese pesticide network Xiaobian reminds everyone: pay attention to 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, photosynthesis is strong, and the stomata on the surface of the stems and leaves are open, which is beneficial to the entry of the medicament, and the surface of the large leaf of the humidity The liquid is dried slowly, and the medicament is easily absorbed to enhance the effect. 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.