Corn Disease Index: Accounts of a number of common fungal diseases, with photographs, notes, treatments.
Major Corn Diseases in North Carolina: Comprehensive review of pest and diseases affecting this state's crops.
Petikam's Page on Banded Leaf and Sheath Blight of Maize: Information about this disease and investigations by researcher at Indian Agricultural Institute. Also contains his curriculum vitae.
Poor growth of maize caused by mineral deficiencies?: Details of research on maize grown in Maputaland, and possible nutrient deficiencies.