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black rust
noun
, Plant Pathology.
- any of several diseases of plants caused by rusts and characterized by black discoloration resulting from the fungal teliospores.
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
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Word History and Origins
Origin of black rust1
An Americanism dating back to 1780–90
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Example Sentences
Dreadful effects are said to be produced by a species of black rust which attacks the large South of Europe reed, Arundo donax.
From Project Gutenberg
In Britain it has been almost universally banished from hedgerows, owing to its connection with the black rust of wheat.
From Project Gutenberg
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