水稻秧苗立枯病是早春旱育秧的常见病害之一，一般在低温或气温忽高忽低时容易发病。发病初期秧苗枯黄卷缩，茎基部腐烂，扯时易断，后期受害常心叶枯萎卷缩，茎基部腐烂软化，病株基部大多有赤色霉状物，是病菌的菌丝体和分生孢子。水稻立枯病一旦发生，轻者影响秧苗素质和成 Rice seedling blight is one of the common diseases in early spring and drought nursery seedlings. It is easy to get sick at low temperature or fluctuating temperature. In the early stage of the disease, the seedlings grew yellowish and curled, the base of the stems decayed, and they were easily torn off. In the later stage, the diseased leaves often wilted and crushed, and the base of the stems became rotten and softened. Most of the diseased plants had red mildew- . Once the occurrence of rice blight, the light affect the quality of seedlings and into