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white rust

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noun
  1. Plant Pathology. 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.

Origin of white rust

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018