近年来由于农业技术的改进和品种大量更换,以及化学农药的大量使用,使水稻害虫种群数量出现了一些新的变化。飞虱类和叶蝉类逐年加重为害,特别是在晚稻后期褐飞虱连年暴发成灾。以往间歇性发生的稻纵卷叶螟,从1971年起连年大发生。稻螟为害也显著加重。此外,稻蓟马、稻螟蛉也在局 In recent years, due to the improvement of agricultural technology and large-scale replacement of varieties, as well as the extensive use of chemical pesticides, the population of rice pests has undergone some new changes. Planthoppers and leafhoppers increase year after year, especially in the late late rice planthopper outbreaks. In the past intermittent occurrence of rice leaf roller, perennial occurrence since 1971. Rice borer damage is also significantly worse. In addition, rice thrips, rice stem borer is also in the Council