玉米大斑病和小斑病的症状识别比较容易;但二者病原菌的识别,由于许多特征极相似,故比较困难,为了预测预报和防治上的需要,通过显微镜下观察鉴定,区别如下: It is relatively easy to identify the pathogen of maize leaf spot and small spot disease. However, the identification of the two pathogenic bacteria is very difficult because of many similarities. In order to predict and control the need, the difference is as follows: