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为减少化学农药给农业生态系带来的不良影响,人们试用植物性农药来干扰害虫的取食行为和调节害虫的生长发育,并把它们称之为第四代农药.据记载,我国应用植物性农药防治害虫,已有悠久的历史。早在二百年前,就已用烟草来杀虫,五十年代末,曾利用苦楝树的果、叶、根、皮的浸出液防治农业害虫,后因杀虫效果差、用量大而中断;六十年代末期以后,印度、英国、西德、美国、菲律宾等国家相继对楝
In order to reduce the adverse effects of chemical pesticides on agricultural ecosystems, people try plant pesticides to interfere with pest feeding behavior and regulate the growth and development of pests, and call them the fourth generation of pesticides.According to records, China’s application of plants Pesticides pest control, has a long history. As early as two hundred years ago, tobacco had been used to kill insects. In the late 1950s, agricultural pests were used to control the agricultural pests after leaching liquid from the neem tree, leaves, roots and skins. However, due to the poor insecticidal effect and large dosage, After the late 1960s, India, Britain, West Germany, the United States, the Philippines and other countries have neem