black rust
noun Plant Pathology.
any of several diseases of plants caused by rusts and characterized by black discoloration resulting from the fungal teliospores.
Nearby words
black root rot, black rot, black ruff, black run, black russian, black rust, black sage, black sapote, black sash, black scoter, black sea
Origin of black rust
An Americanism dating back to 1780–90
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for black rust
black rust
noun
a stage in any of several diseases of cereals and grasses caused by rust fungi in which black masses of spores appear on the stems or leaves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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