随着耕作制度的改革,水稻品种的更换、氮肥用量的增加和化学农药的大量施用杀伤了大量天敌,稻纵卷叶螟已由六十年代间发性的次要害虫,近十年来大发生的频率显著增加,成为影响水稻高产稳产的主要害虫。我们在与纵卷叶螟作斗争的实践中,对发生期中期预测、药治指标和施药方法三个方面进行了研究,现整理如下: 一、关于发生期中期预测,调 With the reform of the tillage system, a large number of natural enemies were destroyed by the replacement of rice varieties, the increase of nitrogen fertilizer use and the large-scale application of chemical pesticides. The rice leafroller has been greatly affected by the secondary pests of the 1960s in the past ten years The frequency of significant increase, become a major pest affecting rice high and stable yield. In the practice of fighting against the leafroller, we conducted a study on the mid-term prediction, the drug treatment index and the method of application. Now we sort out the following: First, on the mid-term forecast,