使用化学农药历来是防治蔬菜害虫最主要的手段,今后仍将是重要手段。因为蔬菜是一年多茬的作物,而且换着方式常因地而异,所以不可能有象果树、森林那样稳定的生态环境。由于这一特点,给研究蔬菜害虫的数量动态带来了极大的困难。在难以掌握数量变化规律的情况下,使用机动性较大 The use of chemical pesticides has always been the most important means of control of vegetable pests and will continue to be an important measure in the future. Because vegetables are crops that are stubbled for more than a year, and they often change in different ways, it is impossible to have a stable ecological environment like fruit trees and forests. Due to this feature, it has brought great difficulties to the research on the quantity dynamics of vegetable pests. In difficult to grasp the law of quantitative changes in the circumstances, the use of greater mobility