Maize (Zea mays, L.) is one of the main cereal crops of West Africa. It is the fourth most consumed cereal during the past two decades, after sorghum, millet and rice in Nigeria. Maize is the world’s highest supplier of calorie with caloric supply of about 19.5%. It provides more calorie than rice (16.5%) and wheat (15.0%). It is one of the most important staple foods in the world today. Maize is also the most important staple food in Nigeria and it has grown to be local ‘cash crop’ most especially in the south-western part of Nigeria where at least 30% of the crop land has been devoted to small-scale maize production under various cropping systems.