1977年长江下游三麦赤霉病发生大流行,三麦普遍减产,我县减产达二成。在病害调查中发现,因品种抗(耐)病性不同,发病率、病情指数和千粒重高低不等。最明显的是早熟三号比尺八大麦抗病性强,平均发病率分别为22.5％和91.1％,平均病情指数分别为8.1％和4.3％,平均千粒重分别比1976年降低了6.4％和10.2％。这就给了我们一个启示,若在秋播前能作出赤霉病的长期予测,采取有效措施,合理安排品种布局,就可使三麦在赤霉病大流行年也能稳产高产。 目前赤霉病的予测方法是在天气预报的基础上制作出来的。天气预报本身就有一定的误差,在此基础上进行赤霉病予测误差就更增大了。我们知道赤霉病的大流行与气 In 1977, the headwaters of the three wheat head blight occurred in the lower reaches of the Yangtze River. The output of the three wheat crops was generally reduced, and the output of the county was reduced by 20%. In the disease survey found that due to the different varieties of anti-(resistant) disease, morbidity, disease index and high and low grain weight range. The most obvious was the early disease resistance of the third barley eight barley disease resistance, the average incidence was 22.5% and 91.1%, the average disease index were 8.1% and 4.3%, respectively, the average 1000-grain weight was reduced by 6.4% and 10.2% %. This gives us an enlightenment. If we can make a long-term forecast of Fusarium head blight before autumn sowing and take effective measures to arrange the variety layout reasonably, we can make Mianmai stable and yield high during the FHI epidemic. The current method for predicting Fusarium head blight is based on the weather forecast. The weather forecast itself has some error, on this basis, the error of forecasting the scab becomes even greater. We know the pandemic and the f