防治农作物病虫草害，虽有许多如农业防治、物理防治、生物防治等方法．但仍以化学防治为主。现代化农业不使用农药，很难达到高产稳产的要求。但在生产实践中，往往出现农药使用效果不佳的情况，究其原因，主要有以下几点：１病虫害诊断错误生产上将病害误诊为虫害，把虫害误 Prevention and control of plant diseases and insect pests, although many such as agricultural control, physical control, biological control and other methods. But still dominated by chemical control. Modern agriculture does not use pesticides, it is difficult to achieve high and stable yield requirements. However, in practice, there are often cases of poor pesticide use. The reasons for this are as follows: 1 The diagnosis of pests and diseases misdiagnosis as pests,