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.
Origin of leaf rust
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for leaf rust
Historical Examples of leaf rust
The only danger in very early planting is that leaf-rust sometimes attacks the forward crop.Agriculture for Beginners
Charles William Burkett