corn smut

noun
a disease of corn caused by a fungus, Ustilago maydis, and characterized by blackish, powdery masses of spores on the affected parts of the plant.

Origin:
1880–85

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Collins
World English Dictionary
corn smut
 
n
1.  an ascomycetous parasitic fungus, Ustilago zeae, that causes gall-like deformations on maize grain
2.  the condition produced by this fungus

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

corn smut

disease of plants caused by the fungus Ustilago maydis, which attacks corn (maize) plants, affecting any aboveground part. The early signs of an attack are whitish galls that later rupture to release dark spores capable of infecting other corn plants. Affected plants are often distorted. The disease is most vigorous in warm weather. Spores overwinter in soil and in corn litter and then infect the next year's planting.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Corn smut, a fungus, has an unexpected benefit: a surprisingly good flavor.
Some days there would be a real thrill: finding corn smut or chasing deer out
  of our main production field.
Influence of corn smut and hail damage on the yield of certain first-generation
  hybrids between synthetic varieties.
Corn smut does not affect enough ears to be a problem.
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