赤霉病是我市三麦的主要病害,平均每三年就有一次大的流行,一般流行年份约占50％,基本不发生的年份仅占20％。在大流行年份中,穗发病率在40—80％,每年因赤霉病而造成的三麦减产幅度约为10—40％。因而,做好赤霉病的预报与防治工作至关重要。近年来,由于采用人工药物防治,使得赤霉病的流行程度大大减轻。因无法保持在不用药的情况下自然发病的原始面貌(姑且 Fusarium head blight is the main disease of Sanmai in our city. There is a big epidemic every three years on average, accounting for about 50% of the popular year and only 20% of the year without the basic occurrence. During the pandemic year, the incidence of spikes is between 40 and 80%, and the annual reduction in yield due to scab is about 10-40%. Therefore, it is very important to forecast and control the scab. In recent years, due to the use of artificial drug prevention and control, scab prevalence greatly reduced. Because of the inability to maintain the original appearance of natural disease without medication (tentatively