Grey Leaf Spot (GLS) is a disease of maize caused primarily by the fungus, Cercospora zeae-maydis. It is an economically important disease of maize and occurs in many countries around the world. It was first reported in Kenya in 1995 and small-holder maize farmers in some parts of Kenya are currently experiencing significant yield losses as a result of the disease. This is a fact sheet providing information on symptoms, recognition, and management options for Maize Grey Leaf Spot.