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How to reduce pesticide residues
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, deep sowing of farmland in the summer or winter before sowing can kill some germs and eggs, and can be used together with the application of adequately decomposed organic fertilizers. After the strengthening of field management, creating environmental conditions suitable for crop growth and unfavorable to the occurrence of pests and diseases can effectively reduce the occurrence of pests. Specifies the scope of use of pesticides. According to the chemical nature and toxicity of pesticides, pesticides that are highly toxic, highly toxic, have large accumulation, and have a long residual effect period are prohibited from use in some crops. Such as chlordane, dicofol, etc., although not highly toxic pesticides, but have accumulated toxic effects, should be prohibited in the consumption of vegetables, tea, tobacco, medicinal herbs and other crops; also as parathion (1605), methyl parathion Phosphate (1059), carbofuran, aldicarb, methamidophos, monocrotophos, etc. should absolutely be prohibited for use on vegetables. Among them, aldicarb, phorate and carbofuran can only be used for seed treatment or soil treatment of cotton seed, wheat seed, corn seed, and sugar beet seed, and other crops should be strictly prohibited from spray application. Parathion is used to control fruit tree pests and must be used 30 days before fruit harvest. Strictly control the pesticide application concentration, application amount, dosage form, frequency, and application methods. In the pesticide formulation, the residual amount of emulsifiable concentrate is larger, the powdered milk and the wettable powder are the next, and the powder is lower. From the application methods, seed treatment, soil treatment, and trunk dressing method have higher residues than spraying and dusting. Special attention should be paid to the application of pesticides that are close to the harvest time of the crops. We must choose the types of drugs with low toxicity and rapid decomposition, and strictly control the dosage, application concentration, application methods, times of application, and time of disuse. Strictly observe the last application time before harvest. According to the safety interval of various pesticides, and according to the principle of early treatment, the use of pesticides in the growth period of crops, early stage of pests, and initial infection of pathogens can greatly reduce pesticide residues. For example, if the safety interval of methyl 1605 in crops such as grains and fruits is 20 days, early application according to the regulations can make the residue of methyl 1605 not exceed the specified 0.2ppm on the fruit picked.