- Written by Tamra Jackson, Extension Plant Pathologist
Common smut occurs in almost every field of corn in
Common smut can be confused with another smut disease of corn that occurs less commonly in
Common smut is also called ‘boil smut’ in some countries because of the development of galls. Galls may develop on any plant part including leaves, stalks, and tassels, but are probably most common and easily recognizable when they develop on the ear replacing kernels. Young galls may be white to gray in color and fleshy to the touch. Galls on stalks and ears tend to be larger than those produced on infected leaves. Large amounts of black teliospores of the fungus develop inside these galls. People in some cultures, especially in
Stalks Infected Leaves
The fungus can survive for long periods of time in the soil or crop residue as thick-walled pigmented teliospores. Teliospores germinate to infect young, actively growing plant parts. Infection normally takes place through the silks or wounds created by hail, insect feeding, or other mechanical injury to any part of the plant. Pollination of silks make it more difficult for the fungus to infect, which is why infection is often more common on the tip of the ear which is pollinated last. Infection of other plant parts is usually not detrimental to the plant and can often be outgrown.
Fungicides are currently not used to manage common smut. And, although resistance is available in corn germplasm for common smut, it is not widely incorporated into commercial hybrids because the disease is not considered to be an important problem in corn.
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