white rust

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Definitions from WordNet

Noun white rust has 1 sense

white rust - fungus causing a disease characterized by a white powdery mass of conidia
--₁ is a kind of fungus
--₁ is a member of Albugo, genus Albugo

Definitions from the Web

White Rust

Noun:

1. A type of plant disease caused by fungi that manifests as white powdery patches on the surface of leaves, stems, or fruits.

Sample sentence: The tomato plants in my garden were afflicted with white rust, causing their leaves to turn pale and powdery.

Noun:

2. A type of corrosion that occurs on the surface of metals, especially zinc, in the form of a white powdery substance.

Sample sentence: The metal railing on the balcony had developed white rust due to exposure to harsh weather conditions.