小麦根腐病又叫极腐叶斑病、斑点病、黑胚病等。主要发生在东北、西北、华北、内蒙等地。黑龙江省春小麦常年因病减产10—30％,严重地块高达50—70％;河北省1973年在沽源、张北两县调查,一般病田白穗率1—10％,严重地块竟达30—50％;内蒙古1974年在伊盟达旗调查,白欧柔品种成熟期病株率60—80％,白穗率仅0.5—1.0％、 Wheat root rot, also known as very rot leaf spot, spot disease, black embryo and so on. Mainly occurred in the northeast, northwest, north China, Inner Mongolia and other places. Heilongjiang Province, perennial due to disease reduction of 10-30% of the total yield, as high as 50-70% of the block; Hebei Province in 1973 in Guyuan, Zhangbei counties surveyed, the general sick white spike rate of 1-10% Up to 30-50%; Inner Mongolia in 1974, the Iraqi League flag survey, Baiou Rou varieties Maturity rate of 60-80% white spike rate of only 0.5-1.0%