收获前穗发芽一直是长江中下游冬麦区、东北春麦区和西南冬麦区的重要灾害，在黄淮冬麦区和北部冬麦区也偶有发生。受灾后有些麦粒虽然外观未发芽，但由于胚的萌动，其面粉结构已被分解转化，严重影响加工品质；明显的穗发芽可使麦粒失去食用价值。在潮湿地区，有时没有明显的 Spike sprouting before harvest has been an important disaster in winter wheat area, northeastern spring wheat area and southwest winter wheat area in the middle and lower reaches of the Yangtze River, and occasionally occurs in Huanghuai winter wheat area and northern winter wheat area. Although some wheat grains did not appear germinated after the disaster, the flour structure was decomposed and transformed due to germination of embryos, which seriously affected the processing quality. The apparent sprouting of wheat caused the loss of edible grain. In wet areas, sometimes not obvious