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利用天敌昆虫消灭农作物害虫,是生物防治的重要组成部分。全国解放以来,农药发展很快,利用化学农药防治害虫,对保证农作物增产起了重要作用。但是,长期大量使用化学农药后,一方面使某些害虫产生了抗药性,防治效果显著下降,同时杀死了自然界中大量的害虫天敌,引起害虫的。“再增猖獗”现象;另一方面,由于化学农药的有毒物质污染水域、空气、土壤和农产品,会影响到人、畜健康和外贸。因此,就需要大力开展生物防治研究工作,保护和
The use of natural enemies of insects to eliminate crop pests, biological control is an important part. Since the liberation of China, the rapid development of pesticides and the use of chemical pesticides to control pests have played an important role in ensuring the increase of crops. However, long-term heavy use of chemical pesticides, on the one hand some of the pests have become drug-resistant, significantly reducing the control effect, killing a large number of natural enemies of pests, causing pests. On the other hand, the pollution of waters, air, soil and agricultural products by chemical toxicants of chemical pesticides will affect the health of human and livestock as well as foreign trade. Therefore, we need to vigorously carry out biological control research, protection and