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在防治病虫草害时,每年都有大量的农药施入农田。如果无节制地滥用这些农药,不仅达不到理想防治效果,影响农产品产量和质量,而且还促使病虫草害产生抗药性,增加防治难度;进而造成防治成本增高、污染环境、破坏生态平衡、影响人体健康等严重后果。为此,必须研究和制定各种农药在防治病虫草害时的有关技术指标,控制施药量、次数和安全间隔期等,以达到保证防治效果和减
In the control of pests and diseases, every year a large number of pesticides applied to farmland. If unbridled abuse of these pesticides, not only fail to achieve the desired effect of prevention and control, affecting the yield and quality of agricultural products, but also to promote resistance to pests and diseases, increasing the degree of prevention and control; thus resulting in increased control costs, environmental pollution, damage to ecological balance and impact Human health and other serious consequences. To this end, we must study and formulate a variety of pesticides in the prevention and control of pests and diseases of the relevant technical indicators, control the dosage, the number of safety intervals and so on, in order to achieve the effect of prevention and control and reduce