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white rust

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
1880-1885
1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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