气候是小麦赤霉病发生早迟和轻重的决定因素。在菌源存在的前提下 ,病害发生轻重主要取决于小麦抽穗扬花期的温度和湿度 ,尤其是湿度。一般 4月中旬至 5月上旬 ,雨日达 9～ 14d可导致其大流行 ,6～ 12d可致中流行 ,少于 5d可致轻流行。而据统计 ,江苏省靖江市常年 4月中、下旬 Climate is a determinant of early and severity of wheat head blight. In the premise of the presence of bacteria, the severity of disease depends mainly on wheat heading and flowering temperature and humidity, especially humidity. Generally mid-April to early May, the rainy day up to 9 ~ 14d can lead to a pandemic, 6 ~ 12d can cause the popular, less than 5d can cause a light pandemic. According to statistics, Jingjiang City, Jiangsu Province, perennial in mid-April, late