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一、国外农药生产和使用现状病菌、害虫、杂草、鼠类等有害生物,能对农业生产造成极大危害。一般认为,它们在农田中为害农作物遭致的产量损失约35%,在收获后的损失约20%。由此可见,全世界农产品每年因病、虫、草、鼠害的损失,将在总产量的50%以上,这数字是惊人的。为了防治这些有害生物,既不能单纯依靠化学农药,又不能排除不用;在当代的综合防治工作中,化学
First, the status of foreign pesticide production and use of bacteria, pests, weeds, rodents and other harmful organisms, can cause great harm to agricultural production. It is generally believed that they have lost about 35% of crop yields in farmland and about 20% of losses after harvest. It can be seen that the loss of diseases, insects, grasses and rodents in agricultural products worldwide will be more than 50% of the total output. This figure is staggering. In order to prevent and control these pests, it is neither possible to rely solely on chemical pesticides nor to exclude them; in the current comprehensive prevention and control work, chemistry