害虫的预测,一般都用气候预测与物候预测。这两种方法都各有利弊,前一方法虽采用较多,但群众不易掌握,普及困难,同时须有一定的科学基础和仪器;而后一方法,观察时虽较难但简单易行,适合大面积防治工作的应用,并不需要什么仪器,就能得到预期的效果。在这方面见到的文献不多,我们抱着拋 Prediction of pests is generally predicted by climate and phenology. Both of these two methods have advantages and disadvantages. Although the former method uses more, the masses are not easy to grasp and popularize. At the same time, they must have certain scientific foundations and instruments. The latter method, though difficult but simple to observe, is suitable The application of large-scale prevention and control work, does not require any equipment, you can get the desired results. There are not many documents I have seen in this area, and we are holding the toss