一为害损失小麦腥黑穗病为害地区,在我国已知有二十五省,不但蔓延地区广大,而且常造成严重损失,在年平均温度十四度下的冬麦区,和寒冷地带的春麦区发生最烈,即以山东而言,在昌潍、昌乐、沂南等县,田间被害率都曾高达百分之九十,在甘肃省海原、固原、西吉、静宁、会宁、定西,田间被害率有达百分 A damage caused by wheat tainted smut damage areas, known in our country has 25 provinces, not only the vast area of ​​spread, and often cause serious losses, the average annual temperature of 14 degrees F Winter wheat area, and cold areas of spring wheat The worst occurred in the district, that is, in terms of Shandong, the rate of field victimization in Changwei, Changle and Yinan counties was as high as 90%. In Gansu Province, Haiyuan, Guyuan, Xiji, Jingning, Huining, Dingxi, the field rate of up to a hundred percent damage