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Meaning of flag smut

flag' smut"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of cereals and other grasses, characterized by stripes of black spores on the affected leaves and stems, which later dry up and become shredded, caused by several smut fungi of the genus Urocystis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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