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:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Wheat stem rust is an important disease and the control of stem rust in wheat relies on the use of genetic resistance.
Stem rust disease is a threat to wheat production worldwide.
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