自从第二次世界大战以来化学农药的合成和推广使用后,对消灭农作物病、虫、杂草危害,确保农业高产稳产起了巨大的作用。据估计全世界每年由于病、虫、杂草对农作物造成的损失可达1000亿美元。关国如果不施农药,每年农产品损失可达150—180 Since the Second World War since the synthesis and promotion of chemical pesticides to use, the elimination of crop diseases, insects and weeds, to ensure high and stable agricultural production has played a huge role. It is estimated that the annual loss of crops to the world due to diseases, insects and weeds can amount to 100 billion U.S. dollars. If you do not Guan country applied pesticides, annual loss of agricultural products up to 150-180