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Meaning of leaf rust

leaf' rust"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease, esp. of cereals and other grasses, characterized by rust-colored pustules of spores on the affected leaf blades and sheaths and caused by any of several rust fungi.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.