Photo and text used courtesy Clemson University
Cooperative Extension Service.

The illustration shows a cross section to reveal damage to kernels as well as the cob. Infection takes place in the field. Losses come not only from rotten grain but also in lowering of test weight and quality. Many ears will actually contain an infection but will not reveal it as characteristic ear rot; thus there will be concealed losses.

Ear rot organisms may survive inside of kernels, on the surface of dernels, and on plant dibris in the soil. Extended high moisture conditions encourage ear rots both in the field and in storage. Insect damage also increases ear rot damage.