According to the new standards for the use of pesticides in tea formulated by countries such as the European Union and Japan, the principles of prevention, prevention and control should be adhered to in the prevention and control of pest-free tea plantations. The use of chemical pesticides should be minimized, and agricultural and biological control must be promoted. And physical control methods promote the use of biological pesticides. When chemical pesticides must be used, they should be used in strict accordance with the prescribed dose and safety intervals according to various pest and disease prevention and control indicators. In addition to the continued prohibition of the use of fenvalerate, rifafen, dicofol, methamidophos, DDT, and BHC in the production of tea in China, the use of acephate and buprofezin (Ulead) will continue to be prohibited. In addition to fluorenone (acetone), experts suggest that the use of avermectin, dimethoate, and tetrazine should be stopped immediately.
Abamectin is a kind of acaricide extracted from the fermentation broth of microorganisms. Because the acute toxicity of its active ingredient is very high, the median lethal dose for rats is 10 mg/kg, and the median lethal dose is the same as that of parathion. (3.5 ~ 12.5mg/kg) similar, is a highly toxic pesticide. Although the active ingredient content of avermectin preparations is very low (usually around 1%), the classification of pesticide toxicity is based on pure compounds, and the EU's maximum limit on avermectin is very strict (0.02mg/ Kg), so it is necessary to ban the use of tea in the production of exports, the use of dimethoate in the production of tea has a long history, but its very high solubility in water (25% at 21 °C), containing dimethoate residues The results of the immersed tea test indicated that about 98% of the dimethoate residues in tea leaves were leached out. Therefore, it is not safe to use dimethoate in tea production from the perspective of food safety. If each person drinks 13g of tea per day (the highest per capita consumption of tea in the world), the amount of dimethoate in tea is calculated at 1mg/kg (GB standard in China), and the dipping rate of dimethoate in tea is calculated as 98%. The amount of dimethoate ingested by drinking tea was 0.01274 mg, which was significantly higher than other pesticides. According to the new standards promulgated by the European Union and Germany, the residue limit of dimethoate in tea is set at 0.05mg/kg. Therefore, the use of dimethoate should be stopped in China's export of tea.
Tetramethoxazine is an acaricide, which was not listed in the previous EU standards, but the latest standard has set the residue limit in tea at 0.55 mg/kg, which is a very strict standard. Therefore, our country The use of tetrazine should also be stopped in the production of exported tea.
With the tightening of the tea residue standards in the importing countries, pesticides used in tea production bases or tea gardens should be properly withered. Among the pyrethroid pesticides, bifenthrin (Uranus) can be considered as the first choice in terms of efficacy, residues and standards. According to the EU standards, the maximum limit of bifenthrin residues can reach 5 mg/kg. Imidacloprid has been widely used in China's tea production in recent years. At present, the EU has not established a standard for this drug. However, the use of imidacloprid will be limited if the “non-standardized pesticides are not detected†provisions. Therefore, be prepared to update and replace. Kiritet can still be used as an acaricide, and the EU standard is set to 5ms/kg. In areas with severe cesium use, the use of lime sulfur after the closure of the park in autumn is still an effective measure. Due to the broad spectrum of endosulfan insecticides and the wide range of standards (30 mg/kg), they can continue to be used.
Abamectin is a kind of acaricide extracted from the fermentation broth of microorganisms. Because the acute toxicity of its active ingredient is very high, the median lethal dose for rats is 10 mg/kg, and the median lethal dose is the same as that of parathion. (3.5 ~ 12.5mg/kg) similar, is a highly toxic pesticide. Although the active ingredient content of avermectin preparations is very low (usually around 1%), the classification of pesticide toxicity is based on pure compounds, and the EU's maximum limit on avermectin is very strict (0.02mg/ Kg), so it is necessary to ban the use of tea in the production of exports, the use of dimethoate in the production of tea has a long history, but its very high solubility in water (25% at 21 °C), containing dimethoate residues The results of the immersed tea test indicated that about 98% of the dimethoate residues in tea leaves were leached out. Therefore, it is not safe to use dimethoate in tea production from the perspective of food safety. If each person drinks 13g of tea per day (the highest per capita consumption of tea in the world), the amount of dimethoate in tea is calculated at 1mg/kg (GB standard in China), and the dipping rate of dimethoate in tea is calculated as 98%. The amount of dimethoate ingested by drinking tea was 0.01274 mg, which was significantly higher than other pesticides. According to the new standards promulgated by the European Union and Germany, the residue limit of dimethoate in tea is set at 0.05mg/kg. Therefore, the use of dimethoate should be stopped in China's export of tea.
Tetramethoxazine is an acaricide, which was not listed in the previous EU standards, but the latest standard has set the residue limit in tea at 0.55 mg/kg, which is a very strict standard. Therefore, our country The use of tetrazine should also be stopped in the production of exported tea.
With the tightening of the tea residue standards in the importing countries, pesticides used in tea production bases or tea gardens should be properly withered. Among the pyrethroid pesticides, bifenthrin (Uranus) can be considered as the first choice in terms of efficacy, residues and standards. According to the EU standards, the maximum limit of bifenthrin residues can reach 5 mg/kg. Imidacloprid has been widely used in China's tea production in recent years. At present, the EU has not established a standard for this drug. However, the use of imidacloprid will be limited if the “non-standardized pesticides are not detected†provisions. Therefore, be prepared to update and replace. Kiritet can still be used as an acaricide, and the EU standard is set to 5ms/kg. In areas with severe cesium use, the use of lime sulfur after the closure of the park in autumn is still an effective measure. Due to the broad spectrum of endosulfan insecticides and the wide range of standards (30 mg/kg), they can continue to be used.
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