１９９８年廊坊市北部地区发生玉米纹枯病，据香河县植保站８月１３至１４日在夏玉米田调查，发病田占调查田的９０％，平均病株率２１．２％，最重的高达７０％，发病初期叶鞘处出现３～４块呈水浸状的淡黄色至淡褐色云纹斑，湿度大时斑块逐渐扩展到茎杆和果穗，发病部位可见 In 1998, corn sheath blight occurred in the northern part of Langfang City. According to the survey conducted by Xianghe Plant Protection Station on summer maize field from August 13 to August 14, the affected fields accounted for 90% of the investigated fields with an average diseased plant rate of 21.2% and the heaviest Up to 70%, 3 to 4 pieces of pale yellow to light brown moire appear in the leaf sheath at the early onset of the disease. When the humidity is high, the patches gradually extend to the stem and the ear, and the incidence part can be seen