Gray Leaf Spot(GLS) of Maize,caused by the fungus Cecrospora zeae-maydis Tehon & Daniels,was first observed in Alexander state and Illinois state in 1924.It takes place in the United States now.

• 玉米灰斑病是由玉蜀黍尾孢菌(Cecrosporazeae-maydisTehon &Daniels)引起的一种病害,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。