Damage to leaves and shafts reveal the presence of Ostrinia furnicalis , Asian or Oriental Corn Borer worm (Image courtesy of CIMMYT).

Older larvae of Asian Corn Borer, Ostrinia furnicalis , bore into the stalk behind the leaf sheath, usually at the node (Image courtesy of CIMMYT).

Ostrinia furnicalis chrysalids on the stalk (Image courtesy of CIMMYT).