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1. It is strictly forbidden to use high-toxicity, highly toxic and high-residue pesticides. Except for several high-efficiency pesticides prohibited by the state, it can not be used for vegetable pesticides according to regulations, such as methylphosphorus, monocrotophos, and phosphorus in carbofuran. It can also not be used in vegetable production, and alternative products with highly toxic pesticides can be used. For example, the control of vegetable aphids can be used with imidacloprid, acetamiprid, pyrethroid pesticides, etc.; for the control of vegetable whitefly, imidacloprid, bifenthrin, matrine, avermectin can be used; Amino Avermectin, Bt compounding agent, and the like.
2. The diagnosis should be accurate. After the onset of the disease, the diagnosis should be accurate. If it is difficult to diagnose, the technician should be promptly diagnosed in the field. According to the disease and condition of the diseased plant, the vegetable disease should be determined, and then the appropriate pesticide should be selected.
3. Grasp the critical period, timely and appropriate use of drugs, improve the efficacy of vegetables, a wide variety of pests and diseases, the occurrence of conditions, damage sooner or later, the degree of damage varies. It is necessary to master the heat when spraying, choose the weak link of pests or diseases, or use the drug in the most sensitive period of pesticides. For the prevention and treatment of vegetable diseases, it is best to use the disease spore germination period, that is, before the onset or early onset; the control of vegetable pests should be used at the peak of adult spawning or before the larval hatching period until the age of 3, because the larvae before the 3rd instar are small. Concentration, the most resistant to drugs, at this time the most important drug control.
Different pesticides use different doses, increase the dosage or increase the concentration of drugs at will, increase the cost and easily cause phytotoxicity of vegetables, and also cause environmental pollution, endangering human and animal safety, causing pesticide residues in vegetables to exceed the standard, so the use of pesticides When there are no special reasons, it should be used according to the recommended dosage of the pesticide instructions.
4. Spraying method should be scientifically suitable. Spraying and dusting should be based on the characteristics of pests and diseases. Generally, it should be thoughtful and uniform during the general control. Focus on the main parts, such as red spider in the back of the leaf, the spray head should spray the leaf back upwards. Spray should pay attention to: 1 depends on the climatic conditions at that time, such as rainy days should not be sprayed, the morning dew is not dry and should not be sprayed, high wind or noon high temperature should not be sprayed, if it rains within 24 hours after spraying, it should be timely sprayed, stomach poison It is good to have no rain effect for at least 48 hours after use. 2 to understand the law of pests and diseases, such as the Noctuidae pests should be used in the evening; and sunrise pests should be used around 9 am. 3 The number of spraying should be determined according to the occurrence of pests and diseases. For example, vegetable diseases should be sprayed once every 10 days, even 2 to 4 times; if the pests are concentrated in the spawning period, they usually spray 1 or 2 times during the incubation period. Powders are often used in greenhouses or greenhouses, such as sprays, which can be appropriately reduced in dosage and ventilated in time to avoid phytotoxicity caused by high temperature and high humidity in the shed.
5. Rotating alternate medication, scientific compounding, and improving the same pests and diseases on the control vegetables. If a pesticide is used continuously, the pests will be resistant to the pesticide, and the control effect will be greatly reduced. Pesticide rotation with different mechanism of action should be selected, alternately used or rationally mixed according to the physical and chemical properties of pesticides. The effectiveness of scientific compounding pesticides is many times stronger than that of single use, which not only plays a role in concurrent treatment and synergy, but also reduces The number of times of administration prevents the development of drug resistance. Before mixing, you should read the instructions for use of the drug. Pay special attention to the fact that acidic pesticides and alkaline pesticides cannot be mixed. Chemical bactericidal pesticides and microbial pesticides are best not mixed.
6. Strictly according to the safety interval of pesticides, the safe interval is the date between the last application of crops based on the disappearance, residue and metabolism of pesticides on crops. It is forbidden to apply drugs during the safety interval. The safety intervals of different pesticides are different, ranging from a few days to a long period of two months. In addition to the regulations, the general pesticides are 5 to 7 days before harvest in the summer; 8 to 10 days before harvest in the winter; and 10 to 15 days before the harvest in the spring, they cannot be used. Make sure to remember the date of the last applied vegetable in order to be harvested after the safe interval.
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Non-polluted vegetables refer to the environment of the production area, the production process, the quality of the target products, in line with the national or agricultural industry pollution-free agricultural product standards and production technical regulations, and qualified by the production and market quality supervision departments, using the pollution-free agricultural products logo sales of vegetable products . Planting pollution-free agricultural products can increase the selling price and expand sales channels. However, in the production of pollution-free vegetables, special attention should be paid to the scientific and rational use of pesticides to effectively control pesticide residues.
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