After applying pesticides to various crops, some residual or excess residues may be present on the surface, fruits and grains of the crops in a certain period of time, and some may penetrate into the waxy layer or the inside of the epidermis. Go, some of the systemic drugs can be absorbed by the crops to other parts, so that in the harvested agricultural products, trace amounts of excess pesticides or toxic metabolites are inevitably left over, and over time, it may harm humans and animals. health.
Minimize the use of pesticides. The selection of pest-resistant varieties is the most economical, safe and effective method for controlling pests and diseases. Secondly, in the summer or in the winter, the cultivated land can be used to kill some germs and eggs, and cooperate with the application of fully decomposed organic fertilizer. After strengthening the field management and creating environmental conditions suitable for crop growth and not conducive to the occurrence of pests and diseases, it can effectively reduce the occurrence of pests.
Specify the scope of use of pesticides. According to the chemical nature and toxicity of pesticides, it is forbidden to use pesticides with high toxicity, high toxicity, large accumulation and long residual period on some crops. Such as chlordane, dicofol, etc., although not highly toxic pesticides, but have cumulative poisoning effects, should be prohibited on vegetables, tea, tobacco, medicinal herbs and other crops; and such as parathion (1605), methyl parathion, Phosphate (1059), carbofuran, aldicarb, methamidophos, monocrotophos, etc. should never be used on vegetables. Among them, alfalfa, phorate and carbofuran can only be used for seed treatment or soil treatment of cottonseed, wheat, corn, sugar beet, etc. Other crops should not be sprayed. Parathion is used to control fruit tree pests and must be used 30 days before fruit harvest.
Strictly control the application concentration, application amount, dosage form, frequency and application method of pesticides. In the agricultural dosage form, the amount of the emulsion oil is large, the milk powder and the wettable powder are the second, and the water agent is lower. From the application method, seed treatment, soil treatment, and tree dressing have higher residues than spraying and dusting. Special attention should be paid to the application of pesticides close to the harvest period of crops. It is necessary to select the variety of drugs with low toxicity and rapid decomposition, strictly control the dosage, concentration, application method, frequency of application and time of disabling.
Strictly follow the last application time before harvest. According to the safety interval of various pesticides, and according to the principle of early treatment, the pesticides can be greatly reduced in the growth period of crops and in the early stages of pests and the initial infection of the bacteria. For example, the safe interval of A 1605 on crops such as grain and fruit is 20 days, and the early application according to the regulations can make the residual amount of methyl 1605 not exceed 0.2 ppm in the harvested fruit.
Minimize the use of pesticides. The selection of pest-resistant varieties is the most economical, safe and effective method for controlling pests and diseases. Secondly, in the summer or in the winter, the cultivated land can be used to kill some germs and eggs, and cooperate with the application of fully decomposed organic fertilizer. After strengthening the field management and creating environmental conditions suitable for crop growth and not conducive to the occurrence of pests and diseases, it can effectively reduce the occurrence of pests.
Specify the scope of use of pesticides. According to the chemical nature and toxicity of pesticides, it is forbidden to use pesticides with high toxicity, high toxicity, large accumulation and long residual period on some crops. Such as chlordane, dicofol, etc., although not highly toxic pesticides, but have cumulative poisoning effects, should be prohibited on vegetables, tea, tobacco, medicinal herbs and other crops; and such as parathion (1605), methyl parathion, Phosphate (1059), carbofuran, aldicarb, methamidophos, monocrotophos, etc. should never be used on vegetables. Among them, alfalfa, phorate and carbofuran can only be used for seed treatment or soil treatment of cottonseed, wheat, corn, sugar beet, etc. Other crops should not be sprayed. Parathion is used to control fruit tree pests and must be used 30 days before fruit harvest.
Strictly control the application concentration, application amount, dosage form, frequency and application method of pesticides. In the agricultural dosage form, the amount of the emulsion oil is large, the milk powder and the wettable powder are the second, and the water agent is lower. From the application method, seed treatment, soil treatment, and tree dressing have higher residues than spraying and dusting. Special attention should be paid to the application of pesticides close to the harvest period of crops. It is necessary to select the variety of drugs with low toxicity and rapid decomposition, strictly control the dosage, concentration, application method, frequency of application and time of disabling.
Strictly follow the last application time before harvest. According to the safety interval of various pesticides, and according to the principle of early treatment, the pesticides can be greatly reduced in the growth period of crops and in the early stages of pests and the initial infection of the bacteria. For example, the safe interval of A 1605 on crops such as grain and fruit is 20 days, and the early application according to the regulations can make the residual amount of methyl 1605 not exceed 0.2 ppm in the harvested fruit.
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