How to reduce pesticide residues
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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 a highly toxic pesticide, but has a cumulative poisoning effect, should be prohibited on the use of vegetables, tea, tobacco, herbs and other crops; and such as parathion (1605), methyl parathion , phorate (1059), carbofuran, aldicarb, methamidophos, monocrotophos, etc. should be absolutely prohibited 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 larger, the milk powder and the wettable powder are the second, and the powder 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, and 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 safety interval of methyl 1605 on crops such as grain and fruit is 20 days, and early application according to regulations can make the residual amount of methyl 1605 not exceed 0.2 ppm on the harvested fruit.