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Second, strictly according to the safe interval of medication When using pesticides, according to the length of the last period of the last use of drugs, decide the time of the next medication. The general pesticide residual period is 7-10 days. Do not use the same pesticide again during the residual period, which not only increases the cost, but also increases the probability of drug damage and the resistance of pests and diseases. It can not be used for a long time after the residual effect period, otherwise it will cause the survival of the remaining pests in the field. For leafy vegetables to be harvested, the remaining pests and diseases in the field will not be catastrophic before the sale of vegetables. If there is no medicine and can cause disasters, the residual effect period should be short, and the low-residue pesticides should be sprayed and killed. sell.
Third, it is strictly forbidden to use highly toxic and highly toxic pesticides to use highly toxic and highly toxic pesticides. Although it can kill pests in a short time, it can quickly kill, but it also kills the natural enemies of pests and increases the content of harmful substances in vegetables. It is easy to cause poisoning of humans and animals after eating. Therefore, it is forbidden to use highly toxic and highly toxic pesticides on vegetables, especially leafy vegetables, and to promote the use of high-efficiency, low-toxic, low-residue pesticides and biological pesticides.
Fourth, it is forbidden to fight drugs at noon Summer and autumn high temperature season, it is easy to cause phytotoxicity and poisoning, especially at noon.
1. Strictly control the concentration of the drug to be applied. The concentration of the drug solution must be moderate. If the concentration is excessive, the amount of the drug may be dead, but it is easy to cause phytotoxicity and prone to poisoning of humans and animals; if the drug concentration is low, the drug volume is small, then Poor control, pests and diseases will also develop resistance.
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