Diplodia Ear RotCORN096.JPG

Diplodia (white) ear rot

Area of impact: Ears

Description: Husks appear pale or bleached. Ear may become bleached and brown and appear shrunken rotten and light. Coarse white or gray fungus develops on the husk or kernels and later black specks appear on the ears. Infection usually begins at the base of the ear.

Pathogen involved: Stenocarpella maydis (a fungus)

Timing/Conditions: Occurs in warm wet weather after flowering. Ears are most vulnerable in the three weeks after silking.

Contributing factors: Damage from insects or birds conservation tillage and corn-on-corn rotation. Overwinters on infested corn debris from previous planting season.

Management practices: Rotate crops and till residue in the fall.

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