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stem rust

noun, Plant Pathology
1.
any of several fungal diseases of plants affecting the stems, especially a disease of wheat and other grasses characterized by pustules of red and then black spores.
2.
any of the fungi causing such a disease.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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6
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