稻纵卷叶螟在我县自1970年上升为水稻的主要害虫之一。每年七、八月份为害严重,特别是单、双季稻混栽地区,其第三、四代为害抽穗期的迟中谷、迟糯谷和孕穗期的“691”以及一季晚的剑叶,对产量影响很大。据1973年观察,稻纵卷叶螟第二代的发生量也在迅 Rice leaf roller in my county since 1970 rose to one of the major pests of rice. In July and August every year, the damage was serious, especially in single-and double-cropped rice mixed planting areas. The third and fourth generations of late delayed mid-trough, late waxy valley and booting stage “691” Yields have a big impact. According to the observation in 1973, the occurrence of the second generation of rice leaf roller is also fast