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长期以来,化学农药对确保农业丰收发挥了重要作用。同时,由于长期使用有机氯、有机汞农药,也产生了种种不良影响。突出的问题是:①杀伤天敌,破坏了生态平衡;②农药残毒、中毒和污染环境;③防治对象产生了抗性。目前,高残毒的有机氯、有机汞农药已逐渐被取代,出现了一批高效安全的新型农药。据统计,全世界重要的农药有500多种,总产量已
For a long time, chemical pesticides played an important role in ensuring the agricultural harvest. At the same time, due to long-term use of organic chlorine, organic mercury pesticides, also had a variety of adverse effects. Prominent issues are: ① killing natural enemies, undermining the ecological balance; ② pesticide residues, poisoning and polluting the environment; ③ control objects have resistance. At present, high residual organic chlorine, organic mercury pesticides have been gradually replaced, there has been a number of new pesticides efficient and safe. According to statistics, there are over 500 kinds of important pesticides in the world and total output has been reached