上蔡县是一个平原农业大县,位于河南省东南部,隶属驻马店市管辖,常年小麦种植面积9.3万公顷左右。随着耕作制度的变化,小麦根腐病的危害朝严重方向发展,特别是苗期感病程度逐年加重,已成为影响小麦高产的一个重要因素。一、病害症状小麦各生育期均可发病,苗期形成苗枯,成株期形成茎基枯死、叶枯和穗枯。幼苗。黑胚严重的种子不能发芽或发芽后尚未出土,芽鞘即变褐腐烂。轻者幼苗虽可出土,但茎基部、叶鞘以及根部产生褐色病斑、幼苗瘦弱、叶色黄 Shangcai County is a plain agricultural county, located in southeastern Henan Province, under the jurisdiction of Zhumadian City, perennial wheat planting area of ​​about 93,000 hectares. With the change of tillage system, the harm of wheat root rot has been heading in a serious direction. In particular, the severity of the disease at the seedling stage has been increasing year by year, which has become an important factor affecting the high yield of wheat. First, the symptoms of disease Wheat growth period can be disease, seedling blight formation, the formation of adult stem-based blight, leaf blight and ear blight. seedling. Black germ serious seeds can not germinate or germinated unearthed, bud sheath that brown decay. Although light seedlings can be unearthed, but the base of the stem, leaf sheath and root brown spots, seedling thin, yellow leaves