Gray leaf spot of maize, caused by Cercospora zeae-maydis Tehon &Daniels, was first found in Alexander County, Illinois in 1924.Now the disease took place in the United States.

• 摘要玉米灰斑病是由玉蜀黍尾孢菌引起的，最早于1924年在美国亚历山大州和伊利诺斯州发现，该病现在美国普遍发生。