Diplodia Ear Rot



Diplodia Ear Rot is a fungal infection of corn.

Signs and symptoms

Dense, white mold. Starts at the base of the ear. Becomes grayish-brown and spreads over the husks and kernels. Raised black fruiting bodies of the fungus can be seen late in the season

Disease Cycle

Favored by wet weather just after silking. More severe when corn is planted after corn. Does not produce toxins.


If your corn crop has ear rot problems this season, there are some management options you can consider to reduce the incidence of these diseases next season. Plant a hybrid with ear rot resistance; avoid planting corn on corn, especially under conservation tillage, and reduce stress on the plants with adequate fertilization and good insect pest management.