Chemical control of tobacco pests and diseases, if the application and management of pesticides is improper, not only can not play a role in the prevention and control of pests and diseases, on the contrary, it will also produce side effects, causing damage to tobacco plants and affecting the quality of tobacco leaves. Pesticide prevention and control should be carried out in a timely manner. The Chinese Pesticide Network Xiaobian teaches you the principles of scientific drug use. The details are as follows:
1. Adhere to the principle of "unification." First, unified pesticide management, that is, the provincial (bureau) company unified the safety, effect, price and other factors of tobacco pesticides to form a recommendation, the state (city) company unified approval and procurement, the county-level companies according to the local The characteristics of pests and diseases in the tobacco area, according to the list of varieties recommended by provincial companies, the local procurement plan is proposed, and the branch company strictly approves and conducts unified procurement, blocking the use of banned pesticides on tobacco from the source, so that the management of tobacco pesticide use can be realized. Sexual norms. The second is to comprehensively prevent comprehensive prevention. According to the characteristics of the main pests and diseases in the local tobacco-growing areas, the time and amount of application are unified, and the planting team is organized to carry out centralized prevention and control and improve the control effect of large-area.
2. Adhere to the "safety" principle. Tobacco is a leaf-based substance. When selecting a pesticide, factors such as the toxicity and residual amount of the pesticide should be taken into account. Generally, high-efficiency, low-toxic, low-residue pesticides are selected.
3. Adhere to the principle of “symptomsâ€. The types of pesticides are different, and the scope and objects of prevention and treatment are also different. Therefore, it is necessary to use symptomatic drugs. In order to avoid unnecessary loss and waste caused by blind medication, it is necessary to correctly diagnose the type of pests and diseases before applying the medicine, and then to prescribe the right medicine and give full play to the prevention and treatment effect of the medicine.
4. Adhere to the principle of "effectiveness." The use of pesticides is not as good as possible. Increasing the amount of pesticides and the number of uses can not only increase the cost but also cause the phytotoxicity of tobacco, increase the pollution, and enhance the resistance of pests and pathogens under the action of high concentration and high dose. , posing a potential danger to future prevention and control. When dispensing, the concentration of the drug should be accurate. Strictly follow the requirements in the instructions, dilute the pesticide to an appropriate concentration with water, so that the agent is evenly dispersed in water and fully dissolved. If the concentration is too high, it will not only cause waste, but also cause phytotoxicity; if it is too low, it will not achieve the control effect.
5. Adhere to the principle of “timelinessâ€. It is necessary to strictly control the time and frequency of application, the application of the drug is too early, and the effect of preventing pests and diseases is not achieved, but it is wasteful; too late, the occurrence of pests and diseases enters the peak period, and the drug resistance is enhanced. Therefore, in order to achieve the effect of using less medicine, it is necessary to use the medicine according to the law of occurrence of pests and diseases, to cure the disease early, to cure the disease, and to control the hazard in time. The number of sprays is mainly determined according to the residual period of the drug and the climatic conditions. For most fungicides, spray once every 10 to 15 days, even 2 to 3 times. The spray should be in a windless weather, and the spray should be replenished in time after the spray. Pesticides that are easily decomposed under strong light should be applied as much as possible on cloudy or evening days; do not use any pesticides on rainy or rainy days.
6. Adhere to the principle of “properâ€. The application method should be appropriate, and the application method should be selected according to the law of pests and diseases, the location of the damage, and the description of the medicament. For soil-borne diseases, root can be used; for wind-borne diseases or above-ground pests, spray control can be used.
7, adhere to the "in place" original test. It is necessary to make the spraying part accurate. There are often two problems in the spraying process: one is to spray the head from the head to the foot regardless of the cause; the other is to spray the front of the leaf and ignore the back of the leaf. Therefore, when spraying, it is necessary to determine the correct spraying position according to the characteristics of the pests and the stage of the disease.
8. Adhere to the principle of “cautionâ€. In the application operation, the selection of the wrong agent, improper application method and excessive dosage, too high concentration, too many application times, and short interval are easy to produce phytotoxicity, causing abnormality or even death of the tobacco plant. Slightly toxic, can be used to speed up fertilizer, irrigation or leaching, accelerate the growth of tobacco plants, can be alleviated in the short term; serious is not easy to save. Therefore, medication should be cautious. In addition, different types of agents should be applied alternately. If a single pesticide is used for a long time, it will lead to resistance of the pests and diseases, thereby reducing the control effect.
9. Adhere to the "green" principle. All kinds of pesticides are poisonous to humans and animals, and safety protection work should be done during the application operation to ensure safe application. Do not apply pesticides with high residual and serious environmental pollution. Pesticide packaging that insists on the use of biological pesticides must be disposed of in a centralized manner and should not be thrown into the fields to avoid pollution.
10. Adhere to the principle of “guidanceâ€. Always use the instructions of the technician when mixing the preparation of the drug or the agent. In particular, it is necessary to pay attention to the analysis of the agents, to understand their respective properties, to determine whether they can be mixed, and only to achieve reasonable compounding can play a role in both governance and synergy.
According to the pesticide network , I believe that as long as the above principles are followed, good drug efficacy can be achieved. To some extent, the safety of tobacco leaves and the benefits of application are also improved.
Galvanized wire is divided into hot dipped galvanized wire and cold galvanized wire (Electro Galvanized Wire). Galvanized wire has good toughness and flexibility, the maximum amount of zinc can reach 350 g /sqm. With zinc coating thickness, corrosion resistance and other characteristics.
Galvanized Wire,Steel Iron Wire,Galvanised Mesh,Electro Galvanized Welded
Shenzhou City Hongda Hardware Products Co.,Ltd , https://www.szhdhardware.com