水稻小水秧烂种烂秧、旱育秧立枯病是早稻育秧期的主要病害。我市早稻秧田年受害面积达1000hm2以上，占秧田总面积的15％以上，尤其是自推广早稻旱育秧以来，秧苗立枯病日趋严重，发病率达30％以上，甚至造成毁灭性损失。1996年早季我市恰遇持续低温、阴雨，造成大面积烂种烂秧 Rotten seedlings of small watery rice seedlings, dry seedling blight is the main disease of early rice seedling. The annual damage area of ​​early rice seedling in our city is more than 1000hm2, accounting for more than 15% of the total area of ​​seedling. Especially since the popularization of dry rice seedling in early rice, the seedling blight becomes more and more serious, the incidence rate is more than 30%, even causing devastating losses. In early 1996, the city just met the continuous low temperature, rainy weather, resulting in large areas of rotten seedlings