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Meaning of white rust

white' rust'

Pronunciation: [key]
  1. a disease of plants, characterized by pustules of white spores on affected parts that become yellow and malformed, caused by fungi of the genus Albugo.
  2. any fungus of the genus Albugo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.