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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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