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leaf rust

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noun Plant Pathology.
a disease, especially of cereals and other grasses, characterized by rust-colored pustules of spores on the affected leaf blades and sheaths and caused by any of several rust fungi.
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Origin of leaf rust

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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