head-smut

head smut

noun Plant Pathology.
a disease of cereals and other grasses, characterized by a dark-brown, powdery mass of spores replacing the affected seed heads, caused by any of several smut fungi of the genera Sorosporium, Sphacelotheca, and Ustilago.
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head smut

noun
smut fungus attacking heads of corn or sorghum and causing a covered smut 
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