了解稻纵卷叶螟低龄(二龄以前)幼虫的为害部位,对于准确地掌握稻纵卷叶螟幼虫密度与孵化进度,指导大面积防治都具有重要意义。为此,1982年我们结合测报工作,对稻纵卷叶螟二、三、四代低龄幼虫为害部位进行了观察。下面根据水稻生育期先后,将观察所见,作一介绍。 Understanding the damaged parts of young (first instar) larvae of Cnaphalocrocis medinalis is of great significance for accurately grasping the larval density and hatching progress of the Cnaphalocrocis medinalis and guiding large-scale control. To this end, we combined with the newspaper in 1982, the second, third and fourth generations of rice leaf roller borer larvae damaged parts were observed. Following the rice growth period has, will observe the observations, make an introduction.