Nigrospora Ear RotCORN103.JPG

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.

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