Howard F. Schwartz, Colorado State University, Bugwood.org

A field corn seedling on the field.

Howard F. Schwartz, Colorado State University, Bugwood.org

Some young field corn plant at the 5-leaf stage of development on the field.

Howard F. Schwartz, Colorado State University, Bugwood.org

Sweet corn plants in the field.

Howard F. Schwartz, Colorado State University, Bugwood.org

Ear of field corn at the silk stage.

Howard F. Schwartz, Colorado State University, Bugwood.org

Field corn plants at the early milk stage.

G.E. Cardon, Bugwood.org

Healthy stalks of field corn.

J.G. Davis, Bugwood.org

Ears of field corn stacked in the field.

H.R. Duke, Bugwood.org

Flexible gated pipe for use in irrigating field corn.

Howard F. Schwartz, Colorado State University, Bugwood.org

A cultivator in operation on a field corn field.

Howard F. Schwartz, Colorado State University, Bugwood.org

Close-up view of an ear of sweet corn on the cob.

Howard F. Schwartz, Colorado State University, Bugwood.org

Ear of field corn at the milk stage, with husks pulled back to show kernels.

Howard F. Schwartz, Colorado State University, Bugwood.org

Close-up view of yellow popcorn seeds.

Howard F. Schwartz, Colorado State University, Bugwood.org

Close-up view of an ear of field corn at the dent stage - husk peeled back to show kernels.

Howard F. Schwartz, Colorado State University, Bugwood.org

Close-up view of dent corn seeds.

J.G. Davis, Bugwood.org

Close-up view of three cobs of blue corn, showing variation in pigmentation of the kernels.

Howard F. Schwartz, Colorado State University, Bugwood.org

Close-up view of blue corn seeds.