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corn: parts of a corn plant. At the top of a mature corn plant is the tassel, the male part of the plant. Along the stalk are the leaves and the ears of corn, wrapped closely in husks. Hundreds of filaments, called silk, protrude from the top of each ear.
Types of Diseases in Corn Plants. The many types of corn diseases are caused by bacteria, viruses, nematodes, fungi and mycoplasms. These are the common causes of diseases in corn crops to watch out for. Throughout the growing season, it is important to maintain a good weed control, fertility and irrigation system.