leaf rust

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:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Leaf rust is an important foliar disease of wheat worldwide.
Early infection lesion of ash leaf rust on white ash.
Resistance to leaf rust may be achieved by adding specific resistant genes to
  wheat.
Identifying sources of resistance to wheat leaf rust under induced and natural
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