我区杂交稻迅速推广之后,自叶枯病的发生与为害出现了一些变化,今就其变化动态以及导致变化的原因粗加探讨,以供生产和科研部门参考。病害变化动态杂交稻推广后,此病的变化主要表现在:1.分布地区明显扩大。杂交稻推广之前,我区仅6个县20余个公社有此病发生,现已 After the rapid popularization of hybrid rice in our region, there have been some changes since the occurrence and damage of the leaf blight. Nowadays, its dynamics of change and the causes of the changes are roughly discussed for the reference of production and scientific research departments. Disease changes Dynamic hybrid rice promotion, the disease changes are mainly manifested in: 1. The distribution of the region was significantly expanded. Before the promotion of hybrid rice, my district only 6 counties more than 20 communes have the disease, is now