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stem rust

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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 of stem rust

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018