What do a.m. and p.m. stand for?

stem rust

noun, Plant Pathology
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.
any of the fungi causing such a disease.
Origin of stem rust
1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for stem rust
  • 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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