wheat rust

noun Plant Pathology.
any of several diseases of wheat caused by rust fungi of the genus Puccinia.

Origin:
1880–85

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World English Dictionary
wheat rust
 
n
1.  a rust fungus, Puccinia graminis, that attacks cereals, esp wheat, and the barberry
2.  the disease caused by this fungus

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Wheat supplies are already failing world wide because of wheat rust, a plant disease.
Rapid global spread of two aggressive strains of a wheat rust fungus.
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