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化学防治是防治蔬菜病虫害的有效手段，见效快、防效高、使用方便，尤其是病害流行、虫害大发生时更是必要的措施。但随着无公害蔬菜的出现，农药残留对人体的危害日益受到人们的重视，保护地蔬菜生产中，如何正确地使用化学防治方法，是一个急待解决的问题。但生产中许多菜农?
Chemical control is an effective measure to prevent and cure vegetable diseases and pests. It has the advantages of quick response, high anti-efficiency and convenient use, especially when the disease is prevalent. It is even more necessary when pests occur. However, with the appearance of pollution-free vegetables, the harm of pesticide residues to the human body has been paid more and more attention by people. How to correctly use chemical control methods in vegetable production in protected areas is an urgent problem to be solved. But many vegetable farmers in production?