A reddish mold appears at the tip and grows down the ear. The fungus overwinters in corn and wheat debris. The disease is favored by cool, wet weather just after silking. Avoid planting in to corn or wheat debris. Caution: Gibberella infected ears may contain the toxins deoxynivalenol (vomitoxin) and zearalenone.
Taken from Corn Production Handbook, KSU Extension