Nigrospora ear rot
Area of impact: Ears
Description: Kernels will be bleached and/or covered with gray fungus and tiny black spores. The cob often shreds at the butt end during mechanical shelling.
Pathogen involved: Nigrospora oryzae (a fungus)
Timing/Conditions: Occurs late in the season when corn is killed or weakened by weather conditions, root injury, leaf blight or stalk rot. Symptoms are most visible after harvest.
Contributing factors: Infertile soils and damaged ears and kernels.
Management practices: Any practices that reduce ear damage.