stem rust

nounPlant 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

Words Nearby stem rust Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024