Keynote teacher Sun Shumin:
He served three years as a technical instructor of Tangxian Agricultural Bureau of Hebei Province, instructed three model villages, 15 model households, and 300 radiation-driven households, guiding the industry to wheat and corn.
Spring came back to the earth and everything recovered. Endless wheat ushered in new green, and wheat entered the green period. At this moment, I deeply feel the importance of my responsibility. What should I do for my model household?
I will instruct them on techniques such as wheat spring tubes, pest control, and wheat field weed control. When fertilizing, pay attention to N, P, K with the application, do not blindly increase N fertilizer. It is necessary to use organic fertilizer as the main source, apply chemical fertilizers rationally, and promote soil testing and formula fertilization techniques. When pests are controlled, ecological control is the main method, and efficient and low-toxicity chemical pesticides are reasonably applied. Reduce the pollution of soil and crops caused by fertilizers and pesticides.
The prevention and control of pests and diseases in wheat fields in the spring are crucial to wheat production. Before returning green to jointing, it must be controlled according to local conditions.
With fertilization and watering, pest control, and weed removal in the wheat fields, farmers' friends will enter a period of intense and busy periods.
In the process of pest and disease control, as farmers repeatedly repeated the use of single drugs, the pests were resistant to the drugs and the control effect was significantly reduced. In order to avoid or delay the emergence of drug resistance, I conducted a face-to-face and detailed explanation on the demonstration households, reminding them to do scientific treatment during the pest control process.
First of all, pay attention to exchange medication. Constant use of different types of drugs to control pests and diseases is the first choice to solve the pest resistance, which can immediately change the problem of poor drug control. Different types of drugs, different functions, the principle of insecticidal sterilization, so the exchange of drugs can effectively prevent pest resistance.
Second, pay attention to the mixed medication. If the systemic drug and the contact agent are used together, the resistance of the systemic drug will be greatly delayed; the use of the complementary drug also greatly delays the resistance and has a significant effect on control. If carbendazim is used in combination with ethamevidazole, any molds that are resistant to carbendazim will be killed by acetylcarbamycin, whereas those resistant to grammectin may be eliminated by carbendazim. The resistance to carbendazim and diethofencarb is significantly reduced by the use of mixed bacteria.
Third, we must pay attention to the use of high-efficiency and low-concentration: low concentrations, appropriate dosages, and effective for pests and diseases. Therefore, the use of a drug starts from this "effective low concentration", and it is not advisable to increase the concentration arbitrarily. The vegetable farmer should use the effective low concentration indicated, or reduce the reference concentration after the experiment and use less drug. As long as the effect is good, you should boldly reduce the concentration, and use high-quality sprays to reduce the use concentration. If the recommended concentration of the pesticide is 600 times, and the test proves that the control effect is still excellent at 1000 times, it should be used from 1000 times.
The fourth is that adding a synergist is an effective method to reduce pesticide resistance. Often the drug is not used much, the number of times has not increased, but the effect is particularly good. There are a variety of synergists. It is also possible to add neutral laundry detergents, mineral oils, vinegar, etc. to increase the adhesiveness, infiltration and exudation, and change the PH value. These can be used as replacements.
The above are emergency measures to prevent pests and pathogens from developing drug resistance. Advocate the use of comprehensive prevention and control, to prevent the main, to overcome blind use of drugs and the abuse of pesticides, improve the prevention and control technology is the fundamental method to avoid resistance, must be taken into account as a whole, do a good job together.
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