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长期以来,生产上常用化学药剂防治病虫,对控制作物病虫的发生危害起了积极作用。但成本高,污染环境,有的化学药剂还杀灭天敌,并易导至害虫产生抗药性。而使用植物性杀虫剂具有成本低,材料易得,方法简便,防效好,且不污染环境,不伤害天敌,不产生药害等优点,有些种类还可起到促进作物生长的作用。现将以蔬菜植物为原料的几种制剂简介
For a long time, pests and diseases have been played by chemical agents commonly used in production, which play a positive role in controlling the occurrence of crop pests and diseases. But the high cost, pollute the environment, and some chemicals also kill natural enemies, and easily lead to insect resistance. The use of plant-based insecticides has the advantages of low cost, easy-to-obtain materials, simple and convenient method, good control effect, no environmental pollution, no harm to natural enemies and no phytotoxicity. Some species may also play a role of promoting crop growth. Now vegetable plants as raw materials of several preparations briefing