水稻霜霉病和苗疫霉病过去很少发生。在近年的有害生物普查中发现这两种病有扩散的趋势。1症状识别早中稻霜霉病在秧田期开始表现症状,到分蘖盛期表现明显。病株萎缩,叶片淡绿并呈斑纹花叶状,斑点黄白色,圆形或椭圆形,排列不规则;抽穗后病株萎缩更明显,株高不足健株的1/2,叶片 Rice downy mildew and Mie disease have rarely occurred in the past. In recent pest surveys, both diseases have been found to have proliferated. 1 Symptoms Identify early mid downy mildew in the seedling stage performance symptoms, to the tillering stage obvious performance. The diseased plants shrank, the leaves were light green and speckled. The spots were yellow-white, round or oval with irregular arrangement. After heading, the atrophy of the diseased plants was more obvious. The plant height was less than 1/2,