打药是防治蔬菜病虫害不可缺少的重要措施之一。因蔬菜病虫害种类多，往往需要同时防治几种病虫害，甚至病虫兼治。为了节省打药用工，常常一药多用，把几种农药混合使用。在混用农药时，应该了解每种农药的性质以及农药之间混用的可能性，否则容易降低药效甚至产生药害。例如 It is one of the most important measures to prevent and cure vegetable pests. Due to the variety of vegetables pests and diseases, often need to control several pests and diseases at the same time, and even pest and disease. In order to save the fight drug laborer, often a multi-purpose medicine, mixes several kinds of pesticides. In the mix of pesticides, should understand the nature of each pesticide and the possibility of mixing between pesticides, or easy to reduce the efficacy or even produce injury. E.g