我场为苏北沿海盐垦区,有近二十年的种稻历史,七十年代以前,以稻苞虫为害为主,稻纵卷叶螟为偶发性害虫。但七十年代以后,稻纵卷叶螟则发展成为严重害虫。现将发生情况简报如下: 一、旱改水以来的虫情 自1960年旱改水以来的近二十年中,稻田虫种组成有了很大的变化。如1960—69年,在 My field for northern coastal salt reclamation area, nearly 20 years of paddy history, before the seventies, mainly to rice stem insects, rice leaf roller borer is an occasional pest. However, after the seventies, rice leaf roller is developed into a serious pest. The briefings on the occurrence of the disease are as follows: I. Insects since drought and water change In the past 20 years since the drought was rectified in 1960, the composition of the insect pests in the paddy field has undergone great changes. As of 1960-69, at