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无公害绿色果品,要求果品中所含有害物质必须符合国家安全标准。因此,其农药残留、重金属和硝酸盐等有害物质含量不能超标,因此,植保中应减少使用化学农药,推广使用生物农药和生物天敌,以保护环境,维持生态平衡。 (一)害虫的无公害防治 1.利用天敌防治害虫。在自然界各种害虫的天敌很多,合理利用这些天敌,对防治害虫具有极大作用。例如:利用赤眼
Pollution-free green fruits require harmful substances contained in fruits must comply with national safety standards. Therefore, its pesticide residues, heavy metals and nitrate and other harmful substances can not exceed the standard, therefore, should reduce the use of chemical pesticides in plant protection, the promotion of the use of biological pesticides and biological predators to protect the environment and maintain ecological balance. (A) pest pollution prevention and control 1. Use of natural enemies to control pests. Natural enemies of many kinds of pests in nature, rational use of these natural enemies, pest control has a great effect. For example: the use of red eyes