营口稻区是我省高产稻区之一，90年代以前很少发生病害。但是进入90年代后，水稻病害频频发生，特别是穗颈稻瘟病，仅在6年中就有两次严重发生，使水稻生产遭受严重损失。防治稻瘟病已是我地区水稻生产的首要问题，为此弄清该地区稻瘟病发生的原因并搞好其防治十分重要。三猪瘟 Yingkou rice area is one of the province’s high yielding rice areas, rarely occurred before the 90s disease. However, after the 1990s, the frequent occurrence of rice diseases, especially the panicle blast, occurred only twice in six years, causing serious losses to rice production. Prevention and control of rice blast is the most important issue of rice production in our region. Therefore, it is very important to find out the causes of rice blast and prevent and control the rice blast in this area. Three swine fever