The major pest of maize in Southern Nigeria is called

The major pest of maize in Southern Nigeria is called "stem borer". Stem borers are insects that tunnel into the stem of the maize plant, causing damage to the plant and reducing its yield. They are common in many parts of the world and can cause significant economic losses to farmers. The stem borer larvae feed on the plant's tissue, causing wilting and stunting of growth. Adult stem borers are typically brown or gray moths that lay their eggs on the maize plant's leaves or stem. When the eggs hatch, the larvae bore into the stem and begin feeding, causing damage to the plant.